Interrupt List, part 11 of 18
Copyright (c) 1989-1999,2000 Ralf Brown

Table of Contents: by Order by Category

Table of Contents by Order
26 - INT 26 - DOS 1+ - ABSOLUTE DISK WRITE (except partitions > 32M)
26----CXFFFF - INT 26 - DOS 3.31+ - ABSOLUTE DISK WRITE (32M-2047M hard-disk partition)
26 - INT 26 - COMTROL HOSTESS i/ISA DEBUGGER - ENTER/EXIT EXTENDED ADDRESSING MODE
27 - INT 27 - DOS 1+ - TERMINATE AND STAY RESIDENT
27 - INT 27 - COMTROL HOSTESS i/ISA DEBUGGER - INVOKE REMOTE TURBO DEBUGGER KERNEL
28 - INT 28 C - DOS 2+ - DOS IDLE INTERRUPT
289999 - INT 28 u - PCXDUMP v9.00+ - INSTALLATION CHECK
29 - INT 29 C - DOS 2+ - FAST CONSOLE OUTPUT
29E60DCL0E - INT 29 - ShowGFX - INSTALLATION CHECK
2A00 - INT 2A - NETWORK - INSTALLATION CHECK
2A0000 - INT 2A - AT&T Starlan Extended NetBIOS (var length names) - INSTALLATION CHECK
2A01 - INT 2A - NETWORK (Microsoft,LANtastic) - EXECUTE NETBIOS REQUEST,NO ERROR RETRY
2A02 - INT 2A - NETWORK (Microsoft) - SET NET PRINTER MODE
2A0300 - INT 2A - NETWORK - CHECK DIRECT I/O
2A04 - INT 2A - NETWORK - EXECUTE NetBIOS REQUEST
2A0500 - INT 2A - NETWORK - GET NETWORK RESOURCE AVAILABILITY
2A06 - INT 2A - NETBIOS, LANtastic - NETWORK PRINT-STREAM CONTROL
2A07 - INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
2A2001 - INT 2A - MS Networks or NETBIOS - ???
2A2002 - INT 2A - NETWORK - ???
2A2003 - INT 2A - NETWORK - ???
2A4147DX0000 - INT 2A U - NetSoft DOS-NET v1.20+ - INSTALLATION CHECK
2A7802 - INT 2A - NETWORK - PC LAN PROG v1.31+ - GET LOGGED ON USER NAME
2A80 - INT 2A CU - NETWORK - BEGIN DOS CRITICAL SECTION
2A81 - INT 2A CU - NETWORK - END DOS CRITICAL SECTION
2A82 - INT 2A CU - NETWORK - END DOS CRITICAL SECTIONS 0 THROUGH 7
2A84 - INT 2A CU - NETWORK - KEYBOARD BUSY LOOP
2A86 - INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
2A8700 - INT 2A CU - PRINT - BEGIN BACKGROUND PRINTING
2A8701 - INT 2A CU - PRINT - END BACKGROUND PRINTING
2A89 - INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
2A90 - INT 2A U - IBM PC 3270 EMULATION PROGRAM - ???
2AC2 - INT 2A U - Network - ???
2AC4 - INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
2AD800 - INT 2A U - Novell NetWare Lite - SERVER - DOS CRITICAL SECTION DISABLE
2AD801 - INT 2A U - Novell NetWare Lite - SERVER - DOS CRITICAL SECTION ENABLE
2AD850 - INT 2A U - Novell NetWare Lite - CLIENT - START SERVER CRITICAL SECTION
2AD851 - INT 2A U - Novell NetWare Lite - CLIENT - END SERVER CRITICAL SECTION
2AD852 - INT 2A U - Novell NetWare - DOS Requester v1.03 - SERVER LOADED
2AD853 - INT 2A U - Novell NetWare - DOS Requester v1.03 - SERVER UNLOADED
2AE0 - INT 2A U - PC Network 1.00 - ???
2AFF90 - INT 2A - PC/TCP PREDIR.EXE - ???
2AFF91 - INT 2A - PC/TCP PREDIR.EXE - ???
2AFF92 - INT 2A - PC/TCP PREDIR.EXE - INSTALLATION CHECK
2AFF93 - INT 2A - PC/TCP PREDIR.EXE - ???
2AFF94 - INT 2A - PC/TCP PREDIR.EXE - ???
2AFF95 - INT 2A - PC/TCP PREDIR.EXE - GET CONFIGURATION STRINGS
2AFF96 - INT 2A - PC/TCP PREDIR.EXE - SET PRINT JOB TERMINATION CONFIGURATION
2AFF97 - INT 2A - PC/TCP PREDIR.EXE - GET PRINT JOB TERMINATION CONFIGURATION
2B - INT 2B - DOS 2+ - RESERVED
2B - INT 2B - IBM ROM-DOS v4.0 - ???
2C - INT 2C - DOS 2+ - RESERVED
2C - INT 2C - STARLITE architecture - KERNEL API
2C - INT 2C R - Cloaking - CALL PROTECTED-MODE PASSALONG CHAIN
2C0000 - INT 2C P - Cloaking - ALLOCATE GDT SELECTOR
2C0001 - INT 2C P - Cloaking - FREE GDT SELECTOR
2C0002 - INT 2C P - Cloaking - SET SEGMENT BASE ADDRESS
2C0003 - INT 2C P - Cloaking - SET SEGMENT LIMIT
2C0004 - INT 2C P - Cloaking - SET SEGMENT ACCESS MODE
2C0005 - INT 2C P - Cloaking - SET SEGMENT EXTENDED ACCESS MODE
2C0006 - INT 2C P - Cloaking - GET PROTECTED-MODE INTERRUPT VECTOR
2C0007 - INT 2C P - Cloaking - SET PROTECTED-MODE INTERRUPT VECTOR
2C0008 - INT 2C P - Cloaking - GET PASSALONG ADDRESS
2C0009 - INT 2C P - Cloaking - SET PASSALONG ADDRESS
2C000A - INT 2C P - Cloaking - GET BASE ADDRESS OF GDT SELECTOR
2C000B - INT 2C P - Cloaking - GET SELECTOR LIMIT
2C - INT 2C P - RM386 v6.00 - CLOAKING - RESERVED FOR CLOAKED BIOS USE UNDER WINDOWS
2C000F - INT 2C P - Cloaking v1.01 - "Simulate_Shell_Event"
2C0011 - INT 2C P - Cloaking v1.01 - "Switch_VMs_and_Call_back"
2C0012 - INT 2C P - Cloaking v1.01 - "Query_Current_VM"
2C0013 - INT 2C P - Cloaking v1.01 - "Issue_System_Modal_Message"
2C001D - INT 2C P - Cloaking v1.01 - GET INT 2C API HANDLER ENTRY POINT
2C001E - INT 2C P - Cloaking v1.01 - CLEAR CRITICAL SECTION
2C001F - INT 2C P - Cloaking v1.01 - SET CRITICAL SECTION
2C0020 - INT 2C P - Cloaking - GET SIZE OF PROTECTED-MODE STATE
2C0021 - INT 2C P - Cloaking - SAVE PROTECTED-MODE STATE
2C0022 - INT 2C P - Cloaking - RESTORE PROTECTED-MODE STATE
2C0023 - INT 2C P - Cloaking - ISSUE PROTECTED-MODE XMS CALL
2C0024 - INT 2C P - Cloaking - SET V86-MODE STACK
2C0025 - INT 2C P - Cloaking - CALL V86-MODE PROCEDURE
2C0026 - INT 2C P - Cloaking - CALL V86-MODE INTERRUPT HANDLER
2C0027 - INT 2C P - Cloaking - CHAIN TO V86-MODE INTERRUPT HANDLER
2C0028 - INT 2C P - Cloaking - GET ESP0 FROM TSS
2C0029 - INT 2C P - Cloaking - SET SECONDARY STACK
2C002A - INT 2C P - Cloaking - SET 8259 IRQ BASE VECTORS
2C002BCH81 - INT 2C P - Cloaking - PROTECTED-MODE VIRTUAL DMA SERVICES
2C002C - INT 2C P - Cloaking - GET PORT-TRAPPING PASSALONG
2C002D - INT 2C P - Cloaking - SET PORT-TRAPPING PASSALONG
2C002E - INT 2C P - Cloaking - TRAP I/O PORT
2C002F - INT 2C PU - Cloaking - UNTRAP I/O PORT
2C0030 - INT 2C PU - Cloaking - GET TRAPPING STATE OF SPECIFIED PORT
2C0031 - INT 2C PU - RM386 v6.00 - BUG
2C0031 - INT 2C P - Cloaking v1.01 - ALLOCATE V86 CALLBACK
2C0032 - INT 2C P - Cloaking v1.01 - FREE V86 CALLBACK
2C0033 - INT 2C P - Cloaking v1.01 - REGISTER CLOAKING CLIENT
2C0034 - INT 2C P - Cloaking v1.01 - UNREGISTER CLOAKING CLIENT
2D - INT 2D - DOS 2+ - RESERVED
2D - INT 2D - ALTERNATE MULTIPLEX INTERRUPT SPECIFICATION (AMIS) [v3.6]
2D--00 - INT 2D - AMIS v3.0+ - INSTALLATION CHECK
2D--01 - INT 2D - AMIS v3.0+ - GET PRIVATE ENTRY POINT
2D--02 - INT 2D - AMIS v3.0+ - UNINSTALL
2D--03 - INT 2D - AMIS v3.0+ - REQUEST POP-UP
2D--04 - INT 2D - AMIS v3.0+ - DETERMINE CHAINED INTERRUPTS
2D--05 - INT 2D - AMIS v3.5+ - GET HOTKEYS
2D--06 - INT 2D - AMIS v3.6 - GET DEVICE-DRIVER INFORMATION
2D--10 - INT 2D - RATSR 2.0+ - GET STATUS
2D--10 - INT 2D - dLite 1.0+ - GET PARAMETER BLOCK ADDRESS
2D--10 - INT 2D - Burnout Plus v3.00 - GET STATE/CONTROL INFORMATION
2D--10 - INT 2D U - Screen Thief v1.00 - FREE HIGH MEMORY BUFFERS
2D--10 - INT 2D U - RAMLIGHT v1.0 - GET MONITORING INFORMATION
2D--10 - INT 2D - DTown Utilities v1.40+ - EXTENDED API INSTALLATION CHECK
2D--10 - INT 2D - CDTSR - GET INTERNAL VARIABLE TABLE
2D--10 - INT 2D - KEYBIT Lite v5+ - GET POINTER TO STATUS BYTE
2D--10 - INT 2D - ALTMENU - GET POINTER TO KEY CODE
2D--11 - INT 2D - dLite 1.0+ - CHECK FOR dPressed FILE AND GET ORIGINAL SIZE
2D--11 - INT 2D - DTown Utilities v1.40+ - UTILITY INSTALLATION CHECK
2D--11 - INT 2D - CDTSR - REPROGRAM CDTSR
2D--12 - INT 2D - dLite 1.0+ - CHECK FOR dPressed FILE AND GET COMPRESSED SIZE
2D--12 - INT 2D - CDTSR - DISABLE POPUP
2D--12 - INT 2D - FREEVER - GET ORIGINAL DOS VERSION INFO
2D--13 - INT 2D - CDTSR - ENABLE POPUP
2D--13 - INT 2D - FREEVER - SET VERSION NUMBERS
2D--14 - INT 2D - FREEVER - ENABLE TSR
2D--15 - INT 2D - FREEVER - DISABLE TSR
2D--16 - INT 2D - FREEVER - GET TSR STATUS
2D--17 - INT 2D - FREEVER - GET TaskMAX STATUS AT INSTALLATION
2D--20 - INT 2D - DTown Utilities v1.40+ - GET POP-UP HANDLER ADDRESS
2D--21 - INT 2D - DTown Utilities v1.40+ - POP UP
2D--50 - INT 2D - DTown Utilities v1.40+ - MEMORY VIEW SET ADDRESS
2D--51 - INT 2D - DTown Utilities v1.40+ - MEMORY VIEW SET REFERENCE
2D--DC - INT 2D C - DAISY.SYS - BROADCAST: CHAIN RESCANNED
2E - INT 2E U - DOS 2+ - PASS COMMAND TO COMMAND INTERPRETER FOR EXECUTION
2E - INT 2E UP - Windows NT - NATIVE API
2E----BXE22E - INT 2E - 4DOS v2.x-3.03 SHELL2E.COM - UNINSTALL
2F - INT 2F - Multiplex - NOTES
2F - INT 2F - BMB Compuscience Canada Utilities Interface - INSTALLATION CHECK
2F - INT 2F - Ross Wentworth's Turbo Pascal POPUP LIBRARY
2F - INT 2F - CiriSOFT Spanish University of Valladolid TSR's Interface
2F00 - INT 2F U - DOS 2.x only PRINT.COM - SUBMIT FILE FOR PRINTING
2F00 - INT 2F U - PSPRINT - PRINT JOB CONTROL
2F0080 - INT 2F - DOS 3.1+ PRINT - GIVE PRINT A TIME SLICE
2F00D8 - INT 2F - Personal NetWare - VLM - ???
2F01 - INT 2F U - DOS 2.x only PRINT.COM - REMOVE FILE FROM PRINT QUEUE
2F0100 - INT 2F - DOS 3.0+ PRINT - INSTALLATION CHECK
2F0100SI20D6 - INT 2F U - PrintCache 3.1 PRINT.COM - INSTALLATION CHECK
2F0101 - INT 2F - DOS 3.0+ PRINT - SUBMIT FILE FOR PRINTING
2F0101SI20D6 - INT 2F U - PrintCache v3.1 PRINT.COM - SUBMIT FILE FOR PRINTING
2F0102 - INT 2F - DOS 3.0+ PRINT - REMOVE FILE FROM PRINT QUEUE
2F0103 - INT 2F - DOS 3.0+ PRINT - CANCEL ALL FILES IN PRINT QUEUE
2F0104 - INT 2F - DOS 3.0+ PRINT - FREEZE PRINT QUEUE TO READ JOB STATUS
2F0105 - INT 2F - DOS 3.0+ PRINT - RESTART PRINT QUEUE AFTER STATUS READ
2F0106 - INT 2F - DOS 3.3+ PRINT - GET PRINTER DEVICE
2F0107 - INT 2F U - PrintCache v3.1 PRINT.COM - SET TRAILING FORM FEEDS
2F0200 - INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - INSTALLATION CHECK
2F0201 - INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
2F0202 - INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
2F0203 - INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
2F0204 - INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
2F - INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
2F0500 - INT 2F U - DOS 3.0+ CRITICAL ERROR HANDLER - INSTALLATION CHECK
2F05 - INT 2F CU - DOS 3.0+ CRITICAL ERROR HANDLER - EXPAND ERROR INTO STRING
2F0600 - INT 2F - DOS 3.0+ ASSIGN - INSTALLATION CHECK
2F0601 - INT 2F U - DOS 3.0+ ASSIGN - GET DRIVE ASSIGNMENT TABLE
2F0800 - INT 2F U - DRIVER.SYS support - INSTALLATION CHECK
2F0801 - INT 2F U - DRIVER.SYS support - ADD NEW BLOCK DEVICE
2F0802 - INT 2F U - DRIVER.SYS support - EXECUTE DEVICE DRIVER REQUEST
2F0803 - INT 2F U - DOS 4.0+ DRIVER.SYS support - GET DRIVE DATA TABLE LIST
2F1000 - INT 2F - SHARE - INSTALLATION CHECK
2F1001 - INT 2F U - DR DOS 6.0+ FDOS EXTENSIONS - INSTALL FDOS HOOK (SHARE / DELWATCH)
2F1002CHFF - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - READ BUFFERS
2F1003 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - FLUSH BUFFERS
2F1004 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - FREE FAT CHAIN
2F1005 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - ALLOCATE CLUSTER
2F1006 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - NEXT CLUSTER / READ FAT???
2F1007 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - UPDATE FAT ENTRY / WRITE FAT???
2F1008 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - FIXUP CHECKSUMS / DIR UPDATE???
2F1009 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - DIRECTORY BUFFER INFO
2F1010CX0000 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - SUPERSTOR - QUERY PHYS FREE SPACE
2F1020 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - CREATE PASSWORD ENTRY
2F1021 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - CHANGE PASSWORD ENTRY
2F1022 - INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - CHECK PASSWORD ENTRY
2F1040 - INT 2F U - DOS 4 only SHARE internal - ???
2F1080 - INT 2F U - DOS 4 only SHARE internal - TURN ON FILE SHARING CHECKS
2F1081 - INT 2F U - DOS 4 only SHARE internal - TURN OFF FILE SHARING CHECKS
2F10FE - INT 2F U - DR DOS 6.0+ DELWATCH.EXE - INSTALLATION CHECK
2F10FF - INT 2F U - DR DOS 5.0 - FIXUP SHARE STUB TABLE???
2F1100 - INT 2F C - NETWORK REDIRECTOR - INSTALLATION CHECK
2F1100SFDADA - INT 2F - MSCDEX (MS CD-ROM Extensions) - INSTALLATION CHECK
2F1101 - INT 2F CU - NETWORK REDIRECTOR - REMOVE REMOTE DIRECTORY
2F1102 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - REMOVE REMOTE DIRECTORY
2F1103 - INT 2F CU - NETWORK REDIRECTOR - MAKE REMOTE DIRECTORY
2F1104 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - MAKE REMOTE DIRECTORY
2F1105 - INT 2F CU - NETWORK REDIRECTOR - CHDIR
2F1106 - INT 2F CU - NETWORK REDIRECTOR - CLOSE REMOTE FILE
2F1107 - INT 2F CU - NETWORK REDIRECTOR - COMMIT REMOTE FILE
2F1108 - INT 2F CU - NETWORK REDIRECTOR - READ FROM REMOTE FILE
2F1109 - INT 2F CU - NETWORK REDIRECTOR - WRITE TO REMOTE FILE
2F110A - INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - LOCK REGION OF FILE
2F110A - INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - LOCK/UNLOCK REGION OF FILE
2F110B - INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - UNLOCK REGION OF FILE
2F110C - INT 2F CU - NETWORK REDIRECTOR - GET DISK INFORMATION
2F110D - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - SET REMOTE FILE'S ATTRIBUTES
2F110E - INT 2F CU - NETWORK REDIRECTOR - SET REMOTE FILE'S ATTRIBUTES
2F110F - INT 2F CU - NETWORK REDIRECTOR - GET REMOTE FILE'S ATTRIBUTES AND SIZE
2F1110 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET REMOTE FILE'S ATTRIBUTES AND SIZE
2F1111 - INT 2F CU - NETWORK REDIRECTOR - RENAME REMOTE FILE
2F1112 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - RENAME REMOTE FILE
2F1113 - INT 2F CU - NETWORK REDIRECTOR - DELETE REMOTE FILE
2F1114 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - DELETE REMOTE FILE
2F1115 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - OPEN REMOTE FILE
2F1116 - INT 2F CU - NETWORK REDIRECTOR - OPEN EXISTING REMOTE FILE
2F1117 - INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE REMOTE FILE
2F1118 - INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE FILE WITHOUT CDS
2F1119 - INT 2F CU - NETWORK REDIRECTOR - FIND FIRST FILE WITHOUT CDS
2F111A - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - FIND NEXT FILE WITHOUT CDS
2F111B - INT 2F CU - NETWORK REDIRECTOR - FINDFIRST
2F111C - INT 2F CU - NETWORK REDIRECTOR - FINDNEXT
2F111D - INT 2F CU - NETWORK REDIRECTOR - CLOSE ALL REMOTE FILES FOR PROCESS (ABORT)
2F111E - INT 2F CU - NETWORK REDIRECTOR - DO REDIRECTION
2F111F - INT 2F CU - NETWORK REDIRECTOR - PRINTER SETUP
2F1120 - INT 2F CU - NETWORK REDIRECTOR - FLUSH ALL DISK BUFFERS
2F1121 - INT 2F CU - NETWORK REDIRECTOR - SEEK FROM END OF REMOTE FILE
2F1122 - INT 2F CU - NETWORK REDIRECTOR - PROCESS TERMINATION HOOK
2F1123 - INT 2F CU - NETWORK REDIRECTOR - QUALIFY REMOTE FILENAME
2F1124 - INT 2F CU - NETWORK REDIRECTOR - TURN OFF REMOTE PRINTER
2F1125 - INT 2F CU - NETWORK REDIRECTOR - REDIRECTED PRINTER MODE
2F1126 - INT 2F CU - NETWORK REDIRECTOR - REMOTE PRINTER ECHO ON/OFF
2F1127 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
2F1127BX4E57 - INT 2F - NetWare 4.0 - REMOTE FILE COPY
2F1128 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
2F1129 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
2F112A - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - CLOSE ALL FILES FOR PROCESS
2F112B - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GENERIC IOCTL
2F112C - INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - "UPDATE_CB" - ???
2F112D - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - EXTENDED ATTRIBUTES
2F112E - INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - EXTENDED OPEN/CREATE FILE
2F112F - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - IFS IOCTL
2F1130 - INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET IFSFUNC SEGMENT
2F1180 - INT 2F - LAN Manager Enhanced DOS Services - ???
2F1181 - INT 2F - LAN Manager Enhanced DOS Services - SET USER NAME???
2F1182 - INT 2F - LAN Manager Enhanced DOS Services - INSTALL SERVICE
2F1184 - INT 2F - LAN Manager Enhanced DOS - ???
2F1186 - INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe
2F118A - INT 2F - LAN Manager 2.0+ DOS Enhanced ENCRYPT.EXE - STREAM ENCRYPTION SERVICE
2F118B - INT 2F - LAN Manager Enhanced DOS - ???
2F118C - INT 2F - LAN Manager Enhanced DOS - ???
2F118E - INT 2F - LAN Manager Enhanced DOS - ???
2F118F - INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe
2F1190 - INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe2
2F1191 - INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe2
2F11F0 - INT 2F - Novell ??? - REMOTE FILE COPY
2F1200 - INT 2F U - DOS 3.0+ internal - INSTALLATION CHECK
2F1201 - INT 2F U - DOS 3.0+ internal - CLOSE CURRENT FILE
2F1202 - INT 2F U - DOS 3.0+ internal - GET INTERRUPT ADDRESS
2F1203 - INT 2F U - DOS 3.0+ internal - GET DOS DATA SEGMENT
2F1204 - INT 2F U - DOS 3.0+ internal - NORMALIZE PATH SEPARATOR
2F1205 - INT 2F U - DOS 3.0+ internal - OUTPUT CHARACTER TO STANDARD OUTPUT
2F1206 - INT 2F U - DOS 3.0+ internal - INVOKE CRITICAL ERROR
2F1207 - INT 2F U - DOS 3.0+ internal - MAKE DISK BUFFER MOST-RECENTLY USED
2F1208 - INT 2F U - DOS 3.0+ internal - DECREMENT SFT REFERENCE COUNT
2F1209 - INT 2F U - DOS 3.0+ internal - FLUSH AND FREE DISK BUFFER
2F120A - INT 2F U - DOS 3.0+ internal - PERFORM CRITICAL ERROR INTERRUPT
2F120B - INT 2F U - DOS 3.0+ internal - SIGNAL SHARING VIOLATION TO USER
2F120C - INT 2F U - DOS 3.0+ internal - OPEN DEVICE AND SET SFT OWNER/MODE
2F120D - INT 2F U - DOS 3.0+ internal - GET DATE AND TIME
2F120E - INT 2F U - DOS 3.0+ internal - MARK ALL DISK BUFFERS UNREFERENCED
2F120F - INT 2F U - DOS 3.0+ internal - MAKE BUFFER MOST RECENTLY USED
2F1210 - INT 2F U - DOS 3.0+ internal - FIND UNREFERENCED DISK BUFFER
2F1211 - INT 2F U - DOS 3.0+ internal - NORMALIZE ASCIZ FILENAME
2F1212 - INT 2F U - DOS 3.0+ internal - GET LENGTH OF ASCIZ STRING
2F1213 - INT 2F U - DOS 3.0+ internal - UPPERCASE CHARACTER
2F1214 - INT 2F U - DOS 3.0+ internal - COMPARE FAR POINTERS
2F1215 - INT 2F U - DOS 3.0+ internal - FLUSH BUFFER
2F1216 - INT 2F U - DOS 3.0+ internal - GET ADDRESS OF SYSTEM FILE TABLE ENTRY
2F1217 - INT 2F U - DOS 3.0+ internal - GET CURRENT DIRECTORY STRUCTURE FOR DRIVE
2F1218 - INT 2F U - DOS 3.0+ internal - GET CALLER'S REGISTERS
2F1219 - INT 2F U - DOS 3.0+ internal - SET DRIVE???
2F121A - INT 2F U - DOS 3.0+ internal - GET FILE'S DRIVE
2F121B - INT 2F U - DOS 3.0+ internal - SET YEAR/LENGTH OF FEBRUARY
2F121C - INT 2F U - DOS 3.0+ internal - CHECKSUM MEMORY
2F121D - INT 2F U - DOS 3.0+ internal - SUM MEMORY
2F121E - INT 2F U - DOS 3.0+ internal - COMPARE FILENAMES
2F121F - INT 2F U - DOS 3.0+ internal - BUILD CURRENT DIRECTORY STRUCTURE
2F1220 - INT 2F U - DOS 3.0+ internal - GET JOB FILE TABLE ENTRY
2F1221 - INT 2F U - DOS 3.0+ internal - CANONICALIZE FILE NAME
2F1222 - INT 2F U - DOS 3.0+ internal - SET EXTENDED ERROR INFO
2F1223 - INT 2F U - DOS 3.0+ internal - CHECK IF CHARACTER DEVICE
2F1224 - INT 2F U - DOS 3.0+ internal - SHARING RETRY DELAY
2F1225 - INT 2F U - DOS 3.0+ internal - GET LENGTH OF ASCIZ STRING
2F1226 - INT 2F U - DOS 3.3+ internal - OPEN FILE
2F1227 - INT 2F U - DOS 3.3+ internal - CLOSE FILE
2F1228BP4200 - INT 2F U - DOS 3.3+ internal - MOVE FILE POINTER
2F1229 - INT 2F U - DOS 3.3+ internal - READ FROM FILE
2F122A - INT 2F U - DOS 3.3+ internal - SET FASTOPEN ENTRY POINT
2F122B - INT 2F U - DOS 3.3+ internal - IOCTL
2F122C - INT 2F U - DOS 3.3+ internal - GET DEVICE CHAIN
2F122D - INT 2F U - DOS 3.3+ internal - GET EXTENDED ERROR CODE
2F122E - INT 2F U - DOS 4.0+ internal - GET OR SET ERROR TABLE ADDRESSES
2F122F - INT 2F U - DOS 4.x internal - SET DOS VERSION NUMBER TO RETURN
2F1230 - INT 2F U - Windows95 - FIND SFT ENTRY IN INTERNAL FILE TABLES
2F1231 - INT 2F U - Windows95 - SET/CLEAR "REPORT WINDOWS TO DOS PROGRAMS" FLAG
2F1250 - INT 2F U - PTS-DOS - SET MACHINE ID
2F1251 - INT 2F U - PTS-DOS - GET MACHINE ID
2F1252 - INT 2F U - PTS-DOS 6.51, S/DOS 1.0+ - SET SFT INCREMENT
2F1253 - INT 2F U - PTS-DOS 6.51, S/DOS 1.0+ - GET SFT INCREMENT
2F1260 - INT 2F C - PTS-DOS 6.51, S/DOS 1.0+ - "EMPTY" (RESERVED FOR INPUT STRING)
2F1261 - INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - GET FIRST UMB
2F1262 - INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - GET DOS COLOR
2F1263 - INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - SET DOS COLOR
2F1270 - INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - "SYSBELL" - EMIT A BEEP
2F1271 - INT 2F C - PTS-DOS, S/DOS - RESERVED FOR BEEP
2F12F0 - INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - BACKDOOR INTERCEPT INT 2Fh CHAIN
2F12F1 - INT 2F - PTS-DOS, S/DOS - RESERVED
2F12FFBL00 - INT 2F - FreeDOS - FDAK-DDT - INSTALLATION CHECK / STATUS CHECK
2F12FFBL01 - INT 2F - FreeDOS - FDAK-DDT - ENABLE FDAK DRIVERS
2F12FFBL02 - INT 2F - FreeDOS - FDAK-DDT - DISABLE FDAK DRIVERS
2F12FFBL03 - INT 2F - FreeDOS - FDAK-DDT - SWITCH BLOCK DEVICE TO READ-ONLY
2F12FFBL04 - INT 2F - FreeDOS - FDAK-DDT - SWITCH BLOCK DEVICE TO READ-WRITE
2F12FFBL05 - INT 2F - FreeDOS - FDAK-DDT - TURN ACTIVITY INDICATOR ON
2F12FFBL06 - INT 2F - FreeDOS - FDAK-DDT - TURN ACTIVITY INDICATOR OFF
2F12FFBL07 - INT 2F - FreeDOS - FDAK-DDT - UNINSTALL
2F12FFBX0000 - INT 2F U - DR DOS 6.0+ IBMBIO.COM - QUERY SIZE OF THE BDOS
2F12FFBX0001 - INT 2F U - DR DOS 6.0+ IBMBIO.COM - RELOCATE THE BDOS
2F12FFBX0002 - INT 2F U - DR DOS 6.0+ IBMBIO.COM - QUERY SIZE OF THE BIOS
2F12FFBX0003 - INT 2F U - DR DOS 6.0+ IBMBIO.COM - RELOCATE THE BIOS
2F12FFBX0005 - INT 2F U - DR DOS 6.0+ - BOOT PHASE BROADCASTS FOR MEMORYMAX/RPLOADER/SECURITY
2F12FFBX0006 - INT 2F U - DR DOS 6+, Novell DOS 7+ - EMM386.EXE - VIDEO MEMORY SPACE CONTROL
2F12FFBX0007 - INT 2F U - Novell DOS 7 - SCRIPT.EXE - GET ???
2F12FFBX0009 - INT 2F - DR DOS 6.0+ IBMBIO.COM - REGISTER ROOT OF UPPER MEMORY LINK
2F12FFBX0106 - INT 2F U - Novell DOS 7+ - MEMORYMAX INSTALLATION CHECK
2F12FFBX0206 - INT 2F - Novell DOS 7+ - MEMORYMAX GET PAGE TABLE ENTRY
2F12FFBX0306 - INT 2F - Novell DOS 7+ - MEMORYMAX SET PAGE TABLE ENTRY
2F12FFBX0406 - INT 2F - Novell DOS 7+ - MEMORYMAX CREATE ACCESS KEY
2F12FFBX0506 - INT 2F - Novell DOS 7+ - MEMORYMAX DESTROY ACCESS KEY
2F12FFBL06 - INT 2F U - Novell DOS 7 - EMM386.EXE - ???
2F12FFBX0EDC - INT 2F U - Novell DOS 7 - EMM386.EXE - CHECK IF MULTITASKING SUPPORT LOADED???
2F13 - INT 2F U - DOS 3.2+ - SET DISK INTERRUPT HANDLER
2F13 - INT 2F U - MS-NET - ???
2F1400 - INT 2F C - NLSFUNC.COM - INSTALLATION CHECK
2F1400BX0EDC - INT 2Fh - DR-DOS NLSFUNC 4.01+ - ENHANCED INSTALLATION CHECK
2F1400 - INT 2F - European MS-DOS 4.0 POPUP - "CheckPu" - INSTALLATION CHECK
2F1401 - INT 2F CU - NLSFUNC.COM - CHANGE CODE PAGE
2F1401 - INT 2F - European MS-DOS 4.0 POPUP - "PostPu" - OPEN/CLOSE POPUP SCREEN
2F1402 - INT 2F CU - NLSFUNC.COM - GET EXTENDED COUNTRY INFO
2F1402 - INT 2F - European MS-DOS 4.0 POPUP - "SavePu" - SAVE POPUP SCREEN
2F1403 - INT 2F CU - NLSFUNC.COM - SET CODE PAGE
2F1403 - INT 2F - European MS-DOS 4.0 POPUP - "RestorePu" - RESTORE SCREEN
2F1404 - INT 2F CU - NLSFUNC.COM - GET COUNTRY INFO
2F14FE - INT 2F U - DR DOS 5.0 NLSFUNC - GET EXTENDED COUNTRY INFORMATION
2F14FF - INT 2F U - DR DOS 5.0+ NLSFUNC - PREPARE CODE PAGE
2F1500 - INT 2F - DOS 4.00 GRAPHICS.COM - INSTALLATION CHECK
2F1500BX0000 - INT 2F - CD-ROM - INSTALLATION CHECK
2F1500CH90 - INT 2F U - CDBLITZ v2.11 - INSTALLATION CHECK
2F1500CH91 - INT 2F U - CDBLITZ v2.11 - GET STATISTICS
2F1500CH92 - INT 2F U - CDBLITZ v2.11 - ENABLE CACHE
2F1500CH93 - INT 2F U - CDBLITZ v2.11 - DISABLE CACHE
2F1500CH94 - INT 2F U - CDBLITZ v2.11 - SET 'MAX' MODE (CACHE BOTH DIRECTORIES AND DATA)
2F1500CH95 - INT 2F U - CDBLITZ v2.11 - SET 'MIN' MODE (CACHE ONLY DIRECTORY ENTRIES)
2F1500CH96 - INT 2F U - CDBLITZ v2.11 - FLUSH CACHE
2F1500CH97 - INT 2F U - CDBLITZ v2.11 - GET CACHE STATISTICS
2F1500CH99 - INT 2F U - CDBLITZ v2.11 - UNINSTALL
2F1501 - INT 2F - CD-ROM - GET DRIVE DEVICE LIST
2F1502 - INT 2F - CD-ROM - GET COPYRIGHT FILE NAME
2F1503 - INT 2F - CD-ROM - GET ABSTRACT FILE NAME
2F1504 - INT 2F - CD-ROM - GET BIBLIOGRAPHIC DOC FILE NAME
2F1505 - INT 2F - CD-ROM - READ VTOC
2F1506 - INT 2F - CD-ROM - TURN DEBUGGING ON
2F1507 - INT 2F - CD-ROM - TURN DEBUGGING OFF
2F1508 - INT 2F - CD-ROM - ABSOLUTE DISK READ
2F1509 - INT 2F - CD-ROM - ABSOLUTE DISK WRITE
2F150A - INT 2F - CD-ROM - RESERVED
2F150B - INT 2F - CD-ROM v2.00+ - DRIVE CHECK
2F150CBX0000 - INT 2F - CD-ROM v2.00+ - GET MSCDEX.EXE VERSION (GET VERSION)
2F150D - INT 2F - CD-ROM v2.00+ - GET CD-ROM DRIVE LETTERS
2F150E - INT 2F - CD-ROM v2.00+ - GET/SET VOLUME DESCRIPTOR PREFERENCE
2F150F - INT 2F - CD-ROM v2.00+ - GET DIRECTORY ENTRY
2F1510 - INT 2F - CD-ROM v2.10+ - SEND DEVICE DRIVER REQUEST
2F15FFBX0000 - INT 2F - CD-ROM - CORELCDX - INSTALLATION CHECK
Section -
Top

Table of Contents by Category

! - document info

- - uncategorized

D - DOS kernel

G - debuggers/debugging tools

I - IBM workstation/terminal emulators

K - keyboard enhancers

N - network

O - other operating systems,

P - printer enhancements

U - resident utilities

V - video

b - vendor-specific BIOS extensions,

c - caches/spoolers,

d - disk I/O enhancements,

f - file manipulation

i - system info/monitoring,

l - shells/command interpreters,

m - memory management,

s - sound/speech,

t - TSR libraries

y - security

INT 26 - DOS 1+ - ABSOLUTE DISK WRITE (except partitions > 32M)
	AL = drive number (00h = A:, 01h = B:, etc)
	CX = number of sectors to write (not FFFFh)
	DX = starting logical sector number (0000h - highest sector on drive)
	DS:BX -> data to write
Return: CF clear if successful
	CF set on error
	    AH = status (see #02547)
	    AL = error code (same as passed to INT 24 in DI)
	    AX = 0207h if more than 64K sectors on drive -- use new-style call
	may destroy all other registers except segment registers
Notes:	original flags are left on stack, and must be popped by caller
	this call bypasses the DOS filesystem, though DOS 5+ invalidates any
	  disk buffers referencing sectors which are written with this call
	examination of CPWIN386.CPL indicates that if this call fails with
	  error 0408h on an old-style (<32M) call, one should retry the
	  call with the high bit of the drive number in AL set
	Novell DOS 7 decides whether the old-style or new-style (>32M) version
	  of INT 26 must be used solely on the basis of the partition's size,
	  thus forcing use of the new-style call even for data in the first
	  32M of the partition
	Windows98 will display an error message and deliberately hang the
	  system on attempted write to any hard disk if neither bit 7 of the
	  Extended Drive Info byte nor bit 6 of "DOS_FLAG" (List-of-Lists+60h)
	  is set
	Although all registers except segment registers may be destroyed
	 some software depends on some of the registers being preserved.
	 For example some Flash disk drivers requires that DX is not trashed.
	 DR-DOS 7.03 takes care of this.
BUGS:	DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an
	  invalid drive number
	DR DOS 3.41 will return with a jump instead of RETF, leaving the
	  wrong number of bytes on the stack; use the huge-partition version
	  (INT 26/CX=FFFFh) for all partition sizes under DR DOS 3.41
	DR DOS 6.0 original releases 05/1991 & 08/1991 reported wrong error
	  codes for "drive not ready" and "write protect". This was fixed
	  with the DR DOS BDOS patch "PAT321" (1992/02/19, XDIR /C: 947Bh)
	  and later "full" rebuilds (see INT21/AX=4452h for details).
SeeAlso: INT 13/AH=03h,INT 25,INT 26/CX=FFFFh,INT 21/AX=7305h,INT 21/AH=91h"PTS"

INT 26 - DOS 3.31+ - ABSOLUTE DISK WRITE (32M-2047M hard-disk partition)
	CX = FFFFh
	AL = drive number (0=A, 1=B, etc)
	DS:BX -> disk write packet (see #02552)
Return: CF clear if successful
	CF set on error
	    AH = status (see #02547)
	    AL = error code (same as passed to INT 24 in DI)
	may destroy all other registers except segment registers
Notes:	partition is potentially >32M (and requires this form of the call) if
	  bit 1 of the device attribute word in the device driver is set
	original flags are left on stack, and must be removed by caller
	this call bypasses the DOS filesystem, though DOS 5+ invalidates any
	  disk buffers referencing sectors which are written with this call
	for FAT32 drives (which may be up to 2TB in size), use INT 21/AX=7305h
	Windows98 will display an error message and deliberately hang the
	  system on attempted write to any hard disk if neither bit 7 of the
	  Extended Drive Info byte nor bit 6 of "DOS_FLAG" (List-of-Lists+60h)
	  is set
SeeAlso: INT 13/AH=03h,INT 25/CX=FFFFh,INT 26,INT 21/AX=7305h

Format of disk write packet:
Offset	Size	Description	(Table 02552)
 00h	DWORD	sector number
 04h	WORD	number of sectors to read
 06h	DWORD	transfer address
SeeAlso: #02548

INT 26 - COMTROL HOSTESS i/ISA DEBUGGER - ENTER/EXIT EXTENDED ADDRESSING MODE
	???
Return: ???
SeeAlso: INT 23"COMTROL",INT 27"COMTROL"

INT 27 - DOS 1+ - TERMINATE AND STAY RESIDENT
	DX = number of bytes to keep resident (max FFF0h)
	CS = segment of PSP
Return: never
Notes:	this is an obsolete call
	INT 22, INT 23, and INT 24 are restored from the PSP
	does not close any open files
	the minimum number of bytes which will remain resident is 110h for
	  DOS 2.x and 60h for DOS 3.0+; there is no minimum for DOS 1.x, which
	  implements this service in COMMAND.COM rather than the DOS kernel
SeeAlso: INT 21/AH=31h

INT 27 - COMTROL HOSTESS i/ISA DEBUGGER - INVOKE REMOTE TURBO DEBUGGER KERNEL
	???
Return: ???
Desc:	invoke a copy of the remote Turbo Debugger kernel on the Hostess i
	  controller
SeeAlso: INT 20"COMTROL",INT 26"COMTROL"

INT 28 C - DOS 2+ - DOS IDLE INTERRUPT
	SS:SP = top of MS-DOS stack for I/O functions
Return: all registers preserved
Desc:	This interrupt is invoked each time one of the DOS character input
	  functions loops while waiting for input.  Since a DOS call is in
	  progress even though DOS is actually idle during such input waits,
	  hooking this function is necessary to allow a TSR to perform DOS
	  calls while the foreground program is waiting for user input.	 The
	  INT 28h handler may invoke any INT 21h function except functions
	  00h through 0Ch.
Notes:	under DOS 2.x, the critical error flag (the byte immediately after the
	  InDOS flag) must be set in order to call DOS functions 50h/51h from
	  the INT 28h handler without destroying the DOS stacks.
	calls to INT 21/AH=3Fh,40h from within an INT 28 handler may not use a
	  handle which refers to CON
	at the time of the call, the InDOS flag (see INT 21/AH=34h) is normally
	  set to 01h; if larger, DOS is truly busy and should not be reentered
	the default handler is an IRET instruction
	supported in OS/2 compatibility box
	the _MS-DOS_Programmer's_Reference_ for DOS 5.0 incorrectly documents
	  this interrupt as superseded
	the performance of NetWare Lite servers (and probably other peer-to-
	  peer networks) can be dramatically improved by calling INT 28
	  frequently from an application's idle loop
SeeAlso: INT 21/AH=34h,INT 2A/AH=84h,INT 2F/AX=1680h

INT 28 u - PCXDUMP v9.00+ - INSTALLATION CHECK
	AX = 9999h
Return: AX = AAAAh if installed
	    CX = version number * 100 (example: 03A2h = 930 = v9.30)
	    DL = interrupt used by the dump function (see #02553)
		(00h if call not available)
	    BX = CS of PCXDUMP's INT 28 handler (undocumented)
	    ES = segment of PCXDUMP's memory block (v9.30, undocumented)
Program: PCXDUMP is a shareware screen grabber saving in PCX format
Notes:	if DL<>00h a dump can be requested by calling INT DL as shown
	  below (the user can choose the interrupt number at installation
	  time); if DL=00h the dump function can be called only by hotkeys
	  (this is the default)

(Table 02553)
Call PCXDUMP screen-dump function with:
	INT xx
	AX = 1234h
	BX = dump type
	    0000h Color dump
	    0001h Immediate color dump
	    0002h Black/White dump
	    0003h Immediate B/W dump
	    0004h Inverted B/W dump
	    0005h Gray scaled dump
	    0006h Inverted gray scaled dump
	    0007h Text screen dump to text file
	    0008h Text screen dump to ansi file
Return: nothing
Notes:	if BX=0001h, 0003h, 0007h or 0008h the whole screen will be
	  dumped; the other valid values will draw a selection frame
	  on the screen except in text modes (text modes allow only
	  full screen dumps)
	this function doesn't perform the dump, it only requests it;
	  the dump will be performed after a few milliseconds if it's
	  safe to do so, thus the author recommends putting a 60 ms delay
	  after this call

INT 29 C - DOS 2+ - FAST CONSOLE OUTPUT
	AL = character to display
Return: nothing
	BX may be destroyed by some versions of DOS 3.3
Notes:	automatically called when writing to a device with bit 4 of its device
	  driver header set (see also INT 21/AH=52h)
	COMMAND.COM v3.2 and v3.3 compare the INT 29 vector against the INT 20
	  vector and assume that ANSI.SYS is installed if the segment is larger
	the default handler under DOS 2.x and 3.x simply calls INT 10/AH=0Eh
	the default handler under DESQview 2.2 understands the <Esc>[2J
	  screen-clearing sequence, calls INT 10/AH=0Eh for all others
SeeAlso: INT 21/AH=52h,INT 2F/AX=0802h,INT 79"AVATAR.SYS"

INT 29 - ShowGFX - INSTALLATION CHECK
	AX = E60Dh
	CL = 0Eh
	DX = C0DEh
Return: DX = DEC0h
Program: ShowGFX is a PCBoard graphics driver by Solar Designer

INT 2A - NETWORK - INSTALLATION CHECK
	AH = 00h
Return: AH <> 00h if installed
	CF set if NetWare v2.15 NetBIOS emulator installed
Note:	supported by PC LAN Program, LAN Manager, LANtastic, NetWare, 10NET,
	  etc.
SeeAlso: INT 5C"NetBIOS"

INT 2A - AT&T Starlan Extended NetBIOS (var length names) - INSTALLATION CHECK
	AX = 0000h
Return: AH = DDh
SeeAlso: INT 5B"Extended NetBIOS"

INT 2A - NETWORK (Microsoft,LANtastic) - EXECUTE NETBIOS REQUEST,NO ERROR RETRY
	AH = 01h
	ES:BX -> NCB (see #03249 at INT 5C"NetBIOS")
Return: AL = NetBIOS error code
	AH = status
	    00h no error
	    01h error occurred
SeeAlso: AH=04h,AX=0500h,INT 5B"Extended NetBIOS",INT 5C"NetBIOS"

INT 2A - NETWORK (Microsoft) - SET NET PRINTER MODE
	AH = 02h
	???
Return: ???

INT 2A - NETWORK - CHECK DIRECT I/O
	AX = 0300h
	DS:SI -> ASCIZ device name (may be full path or only drive specifier--
		  must include the colon)
Return: CF clear if direct physical addressing (INT 13,INT 25) permissible
	CF set if access via files only
Notes:	do not use direct disk accesses if this function returns CF set or the
	  device is redirected (INT 21/AX=5F02h)
	use AH=00h to determine whether the network is installed; if not,
	  direct physical access is allowed
	may take some time to execute, so programs which need to check
	  frequently should save the result of the first call
	this function is called by the DOS kernel on INT 25 and INT 26
	supported by PC LAN Program, LAN Manage, LANtastic, NetWare, 10NET,
	  etc.
SeeAlso: INT 13/AH=02h,INT 13/AH=03h,INT 25,INT 26,INT 21/AX=5F02h

INT 2A - NETWORK - EXECUTE NetBIOS REQUEST
	AH = 04h
	AL = error retry
	    00h automatically retry request on errors 09h, 12h, and 21h
		  (see #03248 at INT 5C"NetBIOS")
	    01h no retry
	    02h ???
	ES:BX -> Network Control Block (see #03249 at INT 5C"NetBIOS")
Return: AX = 0000h if successful
	AH = 01h on error
	    AL = error code
Notes:	invokes either INT 5B or INT 5C as appropriate
	supported by PC LAN Program, LANtastic, LAN Manager, NetWare, 10NET,
	  etc.
	NetWare 2.15 NetBIOS emulator returns CF clear if successful, CF set
	  on error
	PC LAN Program defines any non-zero return value in AH as an error
	  indicator for subfunction 00h, and any non-zero return value in AX
	  as an error indicator for subfunction 01h
SeeAlso: AH=00h,AH=01h,AX=0500h,INT 5B"Extended NetBIOS",INT 5C"NetBIOS"

INT 2A - NETWORK - GET NETWORK RESOURCE AVAILABILITY
	AX = 0500h
Return: AX reserved
	BX = number of network names available
	CX = number of network control blocks available
	DX = number of network sessions available
Notes:	supported by PC LAN Program, LAN Manager, LANtastic, NetWare, 10NET,
	  etc.
	the application should call this function before using any network
	  resources, and maintain its own count to avoid exceeding the
	  network's resource limits
SeeAlso: AH=00h,AH=01h,AH=04h,INT 5C"NetBIOS"

INT 2A - NETBIOS, LANtastic - NETWORK PRINT-STREAM CONTROL
	AH = 06h
	AL = function
	    01h set concatenation mode
		all printer output put in one job until return to DOS prompt
	    02h set truncation mode (default)
		printer open/close or BIOS/DOS output switch starts new job
	    03h flush printer output and start new print job
Return: CF set on error
	    AX = error code
	CF clear if successful
Notes:	subfunction 03h is equivalent to Ctrl/Alt/keypad-*
	supported by PC LAN Program, LANtastic, NetWare, 10NET, etc.
	LANtastic v4.x no longer supports this call
	this function sets the printer mode for all redirected printers
SeeAlso: INT 21/AX=5D08h,INT 21/AX=5D09h,INT 2F/AX=1125h

INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
	AH = 07h
	???
Return: ???
Program: PC Network is an early networking package which was renamed the
	  IBM PC Local Area Network Program (PC LAN Program) as of v1.10
SeeAlso: AH=86h

INT 2A - MS Networks or NETBIOS - ???
	AX = 2001h
	???
Return: ???
Note:	intercepted by DESQview 2.x

INT 2A - NETWORK - ???
	AX = 2002h
	???
Return: ???
Note:	called by MS-DOS 3.30-6.00 APPEND

INT 2A - NETWORK - ???
	AX = 2003h
	???
Return: ???
Note:	called by MS-DOS 3.30-6.00 APPEND

INT 2A U - NetSoft DOS-NET v1.20+ - INSTALLATION CHECK
	AX = 4147h ('AG')
	DX = 0000h
Return: DX = 4147h if installed
	    DS:SI -> configuration data (see #02554)
Program: DOS-NET is a shareware networking package by Albert Graham
Note:	this call is supported by CLIENT.COM, SERVER.COM, ROUTER.COM, and
	  NETDOS.COM
SeeAlso: INT 65/DX=4147h,INT 65/DX=4741h

Format of DOS-NET v1.20 configuration data area:
Offset	Size	Description	(Table 02554)
 00h	BYTE	???
 01h	BYTE	interrupt number used by DOS-NET APIs
 02h	WORD	function number to place in AX for above interrupt
 04h	BYTE	minor version as two BCD digits (e.g. 20h for v1.20)
 05h	BYTE	major version number (01h for v1.20)
 06h  2 BYTEs	???
 08h	WORD	??? (used by ARCNET.COM)
		bit 15: ??? (set by MACTEST.COM)
 0Ah	WORD	??? (used by NDIS.COM and ODI.COM)
 0Ch 22 BYTEs	???
 24h	DWORD	-> ??? function (set by PROTECT.COM)
 28h 12 BYTEs	???
 34h	DWORD	-> ??? function (set by FASTVIEW.COM)
 38h	DWORD	-> ??? function (set by FASTVIEW.COM)
 58h	DWORD	-> ??? (offsets 04h and 1Ah from value are used by NETFILES)
	???
 7Ch	WORD	???
 7Eh	WORD	??? (may be high half of a DWORD at 7Ch)
	???
 A8h	DWORD	-> ??? (used by SM.COM)
	???
114h	WORD	???
116h	WORD	??? (may be high half of a DWORD at 114h)
	???
1BDh	BYTE	??? flags
		bit 0: ???
		bit 6: ???
	???
1E1h	BYTE	???
	???
208h	WORD	??? (used by SM.COM, MACTEST)
282h	WORD	???
284h  2 BYTEs	???
286h	WORD	??? flags
		bit 0: ???
	???
31Eh	WORD	???
320h	WORD	??? (used by NDIS.COM and ODI.COM)
322h  8 BYTEs	???
32Ah	WORD	??? (used by NDIS.COM and ODI.COM)
	???
33Eh  4 BYTEs	??? (used by ODI.COM)
342h  N BYTEs	??? (used by NDIS.COM)
	???
3CFh	BYTE	??? flags
		bit 2: ???
3D2h	BYTE	installed-component flags
		bit 0: PROTECT installed
		bit 1: NETCACHE installed
		bit 3: SM.COM installed
		bit 7: NETDEBUG installed
3D3h	BYTE	installed-component flags
		bit 0: NETFILES installed
		bit 6: FASTVIEW installed
	???
3FFh	BYTE	??? (used by NDIS.COM)
400h	BYTE	???
401h	BYTE	??? (used by SM.COM)
402h	BYTE	??? (used by SM.COM)
	???
448h	BYTE	???
449h	BYTE	??? (used by MACTEST)
44Ah	BYTE	??? (used by PROTECT)
44Bh	BYTE	???
44Ch	BYTE	???
44Dh	BYTE	??? (used by SM.COM)
44Eh	BYTE	??? (used by SM.COM, MACTEST)
	???

INT 2A - NETWORK - PC LAN PROG v1.31+ - GET LOGGED ON USER NAME
	AX = 7802h
	ES:DI -> 8-byte buffer to be filled
Return: AL = 00h if no user logged on to Extended Services
	AL <> 00h if user logged on to Extended Services
	    buffer at ES:DI filled with name, padded to 8 chars with blanks.

INT 2A CU - NETWORK - BEGIN DOS CRITICAL SECTION
	AH = 80h
	AL = critical section number (00h-0Fh) (see #02555)
Notes:	normally hooked to avoid interrupting a critical section, rather than
	  called
	the handler should ensure that none of the critical sections are
	  reentered, usually by suspending a task which attempts to reenter
	  an active critical section
	the DOS kernel does not invoke critical sections 01h and 02h unless it
	  is patched.  DOS 3.1+ contains a zero-terminated list of words
	  beginning at offset -11 from the Swappable Data Area
	  (see #01687 at INT 21/AX=5D06h); each word contains the offset within
	  the DOS data segment of a byte which must be changed from C3h (RET)
	  to 50h (PUSH AX) under DOS 3.x or from 00h to a nonzero value under
	  DOS 4.0+ to enable use of critical sections.	For DOS 4.0+, all
	  words in this list point at the byte at offset 0D0Ch.
	MS Windows patches the DOS kernel's calls to INT 2A/AH=80h-81h into
	  far calls to its own handler, and does not reflect the calls back
	  to INT 2A unless SYSTEM.INI contains ReflectDOSInt2A=1 or
	  ModifyDOSInt2A=0 in the [386Enh] section
	Novell NETX does not issue INT 2A/AH=80h and INT 2A/AH=81h calls when
	  it intercepts INT 21 calls and processes them itself
SeeAlso: AH=81h,AH=82h,AX=8700h,INT 21/AX=5D06h,INT 21/AX=5D0Bh

(Table 02555)
Values for DOS critical section number:
 01h	DOS kernel, SHARE.EXE, DOSMGR
	apparently for maintaining the integrity of DOS/SHARE/NET
	  data structures
 02h	DOS kernel, DOSMGR
	ensures that no multitasking occurs while DOS is calling an
	  installable device driver
 05h	network redirector
 06h	DOS 4.x only IFSFUNC
 08h	ASSIGN.COM
 0Ah	MSCDEX, CORELCDX
 0Fh	IBM PC LAN server (while intercepting INT 10/AH=06h,07h,0Eh)

INT 2A CU - NETWORK - END DOS CRITICAL SECTION
	AH = 81h
	AL = critical section number (00h-0Fh) (see #02555)
Notes:	normally hooked rather than called
	the handler should reawaken any tasks which were suspended due to an
	  attempt to enter the specified critical section
	MS Windows patches the DOS kernel's calls to INT 2A/AH=80h-81h into
	  far calls to its own handler, and does not reflect the calls back
	  to INT 2A unless SYSTEM.INI contains ReflectDOSInt2A=1 or
	  ModifyDOSInt2A=0 in the [386Enh] section
SeeAlso: AH=80h,AH=82h,AX=8700h

INT 2A CU - NETWORK - END DOS CRITICAL SECTIONS 0 THROUGH 7
	AH = 82h
Notes:	called by the INT 21h function dispatcher for function 0 and functions
	  greater than 0Ch except 59h, and on process termination
	the handler should reawaken any tasks which were suspended due to an
	  attempt to enter one of the critical sections 0 through 7
SeeAlso: AH=81h

INT 2A CU - NETWORK - KEYBOARD BUSY LOOP
	AH = 84h
Notes:	similar to DOS's INT 28h, called from inside the DOS keyboard input
	  loop (i.e. INT 21/AH=07h or INT 21/AH=08h) to allow the network
	  software to process requests
	Novell DOS 7+ calls this function with AX=8400h from inside of
	  the keyboard input loop.
SeeAlso: INT 28

INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
	AH = 86h
	???
Return: ???
SeeAlso: AH=07h,AH=C4h

INT 2A CU - PRINT - BEGIN BACKGROUND PRINTING
	AX = 8700h
	CF clear
Return: CF clear if OK to print in background now
	CF set if background printing not allowed at this time
Desc:	used to inform interested programs that PRINT is about to start its
	  background processing, and allow those programs to postpone the
	  processing if necessary
Notes:	when PRINT gains control and wants to begin printing, it calls this
	  function.  If CF is clear on return, PRINT begins its background
	  processing, and calls AX=8701h when it is done.  If CF is set on
	  return, PRINT will relinquish control immediately, and will not
	  call AX=8701h
	PCVENUS (an early network shell by IBM and CMU) hooks this call to
	  prevent background printing while its own code is active
SeeAlso: AH=80h,AH=81h,AX=8701h

INT 2A CU - PRINT - END BACKGROUND PRINTING
	AX = 8701h
Desc:	used to inform interested programs that PRINT has completed its
	  background processing
Note:	called by PRINT after it has performed some background printing; not
	  called if AX=8700h returned with CF set.
SeeAlso: AX=8700h

INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
	AH = 89h
	AL = ???  (ASSIGN uses 08h)
	???
Return: ???

INT 2A U - IBM PC 3270 EMULATION PROGRAM - ???
	AH = 90h
	???
Return: ???
Note:	the LANtastic redirector and SERVER.EXE use this function with AL=01h,
	  03h-07h,0Ch-11h

INT 2A U - Network - ???
	AH = C2h
	AL = subfunction
	    07h ???
	    08h ???
	BX = 0001h
	???
Return: ???
Note:	this function is called by the DOS 3.30-6.00 APPEND

INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
	AH = C4h
	AL = subfunction
	    07h ???
	    08h ???
	BX = ???
	???
Return: ???
SeeAlso: AH=86h

INT 2A U - Novell NetWare Lite - SERVER - DOS CRITICAL SECTION DISABLE
	AX = D800h
Return: nothing
Desc:	sets ??? flag, and sets ??? to initial value
Note:	called by CLIENT for communication between client and server
SeeAlso: AX=D801h,AX=D850h

INT 2A U - Novell NetWare Lite - SERVER - DOS CRITICAL SECTION ENABLE
	AX = D801h
Return: nothing
Desc:	clears the ??? flag set by AX=D800h
Note:	called by CLIENT for communication between client and server
SeeAlso: AX=D800h,AX=D850h

INT 2A U - Novell NetWare Lite - CLIENT - START SERVER CRITICAL SECTION
	AX = D850h
Return: nothing
Desc:	increments an internal byte-sized counter
Note:	this function is intercepted by DV/X 1.10 PEERSERV.DVR and the
	  Advanced NetWare 4.0 DOS Requester
SeeAlso: AX=D851h

INT 2A U - Novell NetWare Lite - CLIENT - END SERVER CRITICAL SECTION
	AX = D851h
Return: nothing
Desc:	resets an internal byte-sized counter to zero
Note:	this function is intercepted by DV/X 1.10 PEERSERV.DVR and the
	  Advanced NetWare 4.0 DOS Requester
SeeAlso: AX=D850h

INT 2A U - Novell NetWare - DOS Requester v1.03 - SERVER LOADED
	AX = D852h
Return: ???
Note:	calls the NetWare Lite SERVER installation check, and sets ??? pointer
SeeAlso: AX=D853h,INT 2F/AX=D880h

INT 2A U - Novell NetWare - DOS Requester v1.03 - SERVER UNLOADED
	AX = D853h
Return: ???
Note:	clears the pointer set by AX=D852h
SeeAlso: AX=D852h

INT 2A U - PC Network 1.00 - ???
	AH = E0h
	AL = subfunction??? (01h,02h, maybe others)
	???
Return: ???
Note:	called by PCNet 1.00 NET.COM, a shell program from which others are run

INT 2A - PC/TCP PREDIR.EXE - ???
	AX = FF90h
Return: AX = ???
Note:	PREDIR.EXE is the network printer redirector included as part of the
	  PC/TCP system by FTP Software, Inc.

INT 2A - PC/TCP PREDIR.EXE - ???
	AX = FF91h
	BX = ???
Return: AX = status???

INT 2A - PC/TCP PREDIR.EXE - INSTALLATION CHECK
	AX = FF92h
Return: AX = 0000h if installed
	   BX = redirected printer port (FFFFh if no printers redirected)
	   CX = version (CH = major, CL = minor)
Note:	PREDIR.EXE is the network printer redirector included as part of the
	  PC/TCP system by FTP Software, Inc.

INT 2A - PC/TCP PREDIR.EXE - ???
	AX = FF93h
Return: AX = ???

INT 2A - PC/TCP PREDIR.EXE - ???
	AX = FF94h
	BX = ???
	CX = ???
	DX = ???
Return: AX = ???
Note:	PREDIR.EXE is the network printer redirector included as part of the
	  PC/TCP system by FTP Software, Inc.

INT 2A - PC/TCP PREDIR.EXE - GET CONFIGURATION STRINGS
	AX = FF95h
	CX = what to get
	    0000h ??? (returned pointer to "C:\COMMAND.COM")
	    0001h spooling program
	    0002h ???
	    0003h spool file name
	    0004h swap file name
Return: AX = status
	    0000h successful
	BX:DX -> ASCIZ configuration string

INT 2A - PC/TCP PREDIR.EXE - SET PRINT JOB TERMINATION CONFIGURATION
	AX = FF96h
	CX = what to set
	    0000h ???
	    0001h print-on-hotkey state
	    0002h print-on-exit state
	    0003h print job timeout in clock ticks
	    0004h print-on-EOF state
	BX = new value (0000h disabled, 0001h enabled except for timeout)
Return: AX = ???
SeeAlso: AX=FF97h
Note:	PREDIR.EXE is the network printer redirector included as part of the
	  PC/TCP system by FTP Software, Inc.

INT 2A - PC/TCP PREDIR.EXE - GET PRINT JOB TERMINATION CONFIGURATION
	AX = FF97h
	CX = what to get
	    0000h ???
	    0001h print-on-hotkey state
	    0002h print-on-exit state
	    0003h print job timeout in clock ticks
	    0004h print-on-EOF state
Return: AX = status
	    0000h successful
	BX = old value (0000h disabled, 0001 enabled except for timeout)
SeeAlso: AX=FF96h

INT 2B - DOS 2+ - RESERVED
Note:	this vector is not used in MS-DOS versions <= 6.22, and points at an
	  IRET instruction

INT 2B - IBM ROM-DOS v4.0 - ???
	AH = function
	    00h ??? (modifies data in IBMBIO.COM)
	    01h internal operations
	    02h ???
		AL = index (00h-0Ch)
		Return: AX = ??? or (CMOS 2Dh and CMOS 2Eh)
	    03h get ??? data
		Return: AX = (CMOS 2Dh and CMOS 2Eh)
			BX = FFFFh
	    other does nothing
Note:	function 03h is called by ROMSHELL.COM; if BX != 0, then the ES:DI from
	  INT 2F/AX=1982h points at valid data
SeeAlso: INT 2F/AX=1982h

INT 2C - DOS 2+ - RESERVED
Note:	this vector is not used in DOS versions <= 6.00, and points at an IRET

INT 2C - STARLITE architecture - KERNEL API
Note:	STARLITE is an architecture by General Software for a series of MS-DOS
	  compatible operating systems (OEM DOS, NETWORK DOS, and SMP DOS) to
	  be released in 1991.	The interrupt number is subject to change
	  before the actual release.

INT 2C R - Cloaking - CALL PROTECTED-MODE PASSALONG CHAIN
Notes:	when this interrupt is invoked in V86 mode, RM386 will invoke the first
	  in a chain of protected-mode handlers, and will only pass execution
	  to the V86-mode INT 2C handler if none of the handlers in the
	  passalong chain handle the call instead.  This is the method by which
	  the real-mode stub of a cloaked application communicates with the
	  protected-mode portion.
	the cloaking host calls the passalong chain with EAX=58494E33h ('WIN3')
	  when MS Windows starts up and with EAX=334E4958h ('3NIW') when
	  Windows shuts down; between these two broadcasts, the additional
	  Windows-only Cloaking services are available
	this function was first introduced with RM386 (RAM-MAN/386) v6.00, the
	  memory manager included in Helix Software's Netroom
SeeAlso: INT 2C/AX=0009h,INT 2F/AX=4310h"Cloaking"

INT 2C P - Cloaking - ALLOCATE GDT SELECTOR
	AX = 0000h
	EBX = base address
	CL = access mode byte
	CH = extended access mode byte (omit limit field)
	EDX = segment limit
Return: CF clear if successful
	    AX = selector
	CF set on error
	    AX = error code (see #02556)
Notes:	this INT 2C interface is used by Netroom's DPMI.EXE v3.00
	to access extended memory, set the base address to the desired
	  physical address plus 400000h (4M)
	this function was first introduced with RM386 (RAM-MAN/386) v6.00, the
	  memory manager included in Helix Software's Netroom
SeeAlso: AX=0001h,AX=0002h,AX=0003h,AX=0004h,AX=0005h,INT 31/AH=57h,#00501

(Table 02556)
Values for Cloaking error code:
 0001h	no more selectors
 0002h	not a GDT ring 0 selector
 0003h	invalid selector (out of range, not user selector)
 0004h	selector not allocated

INT 2C P - Cloaking - FREE GDT SELECTOR
	AX = 0001h
	SI = selector
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02556)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,INT 2F/AX=4310h"Cloaking"

INT 2C P - Cloaking - SET SEGMENT BASE ADDRESS
	AX = 0002h
	SI = selector
	EBX = new physical base addres
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02556)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,AX=0003h,AX=0004h,INT 31/AX=0007h,#00501

INT 2C P - Cloaking - SET SEGMENT LIMIT
	AX = 0003h
	SI = selector
	EBX = new limit
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02556)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,AX=0002h,AX=0004h,INT 31/AX=0008h

INT 2C P - Cloaking - SET SEGMENT ACCESS MODE
	AX = 0004h
	SI = selector
	CL = new access mode byte (see #00502)
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02556)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,AX=0002h,AX=0003h,AX=0005h,INT 31/AX=0009h

INT 2C P - Cloaking - SET SEGMENT EXTENDED ACCESS MODE
	AX = 0005h
	SI = selector
	CL = new extended access mode byte (limit field ignored) (see #02557)
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02556)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,AX=0002h,AX=0003h,AX=0004h,INT 31/AX=0009h

Bitfields for extended access mode byte:
Bit(s)	Description	(Table 02557)
 7	4K granularity instead of byte granularity
 6	32-bit code segment
 5	reserved (0)
 4	segment available to system
SeeAlso: #00505

INT 2C P - Cloaking - GET PROTECTED-MODE INTERRUPT VECTOR
	AX = 0006h
	CL = vector (00h-7Fh)
Return: CF clear
	DX:EBX -> current interrupt handler
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0007h,INT 31/AX=0204h

INT 2C P - Cloaking - SET PROTECTED-MODE INTERRUPT VECTOR
	AX = 0007h
	CL = vector (00h-7Fh)
	DX:EBX -> interrupt handler
Return: CF clear
Notes:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
	the IDT entry's type remains unchanged
SeeAlso: AX=0006h,INT 31/AX=0205h

INT 2C P - Cloaking - GET PASSALONG ADDRESS
	AX = 0008h
Return: CF clear
	DX:EBX = current passalong address
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0009h,AX=002Ch,INT 2F/AX=4310h"Cloaking"

INT 2C P - Cloaking - SET PASSALONG ADDRESS
	AX = 0009h
	DX:EBX = new value for passalong address (see #02558)
Return: CF clear
Notes:	when an INT 2C instruction is executed in V86 mode, the Cloaking host
	  calls the passalong address.	The handler should check whether the
	  upcall is of interest to it, and if not it should jump to the old
	  passalong address (retrieved with AX=0008h before the handler was
	  installed).  The final handler should return with CF clear to cause
	  the interrupt to be reflected back to V86 mode if none of the
	  passalong handlers is triggered
	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0008h,AX=002Dh,INT 2C"PASSALONG CHAIN"

(Table 02558)
Values Cloaking passalong address is called with:
	EAX = CS:IP of byte following INT 2C instruction invoking passalong
	SS:EBX -> caller registers (see #02559)
	CF clear
	others undefined
Return: CF clear: pass along to V86-mode INT 2C handler
	CF set: return immediately to V86 mode

Format of Cloaking caller registers:
Offset	Size	Description	(Table 02559)
 00h	DWORD	EDI
 04h	DWORD	ESI
 08h	DWORD	EBP
 0Ch	DWORD	reserved (ESP from PUSHAD instruction)
 10h	DWORD	EBX
 14h	DWORD	EDX
 18h	DWORD	ECX
 1Ch	DWORD	EAX
 20h	DWORD	error code
 24h	DWORD	EIP
 28h	WORD	CS
 2Ah	WORD	padding
 2Ch	DWORD	EFLAGS
 30h	DWORD	ESP
 34h	WORD	SS
 36h	WORD	padding
--remainder not available if protected-mode ring3 trap---
 38h	WORD	ES
 3Ah	WORD	padding
 3Ch	WORD	DS
 3Eh	WORD	padding
 40h	WORD	FS
 42h	WORD	padding
 44h	WORD	GS
 46h	WORD	padding

INT 2C P - Cloaking - GET BASE ADDRESS OF GDT SELECTOR
	AX = 000Ah
	SI = selector
Return: CF clear if successful
	    EBX = segment base address
	CF set on error
	    AX = error code (see #02556)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00, the
	  memory manager included in Helix Software's Netroom
SeeAlso: AX=0000h,AX=0002h,AX=000Bh

INT 2C P - Cloaking - GET SELECTOR LIMIT
	AX = 000Bh
	SI = selector
Return: CF clear if successful
	    EBX = segment base address
	CF set on error
	    AX = error code (see #02556)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=000Ah,INT 2F/AX=4310h"Cloaking"

INT 2C P - RM386 v6.00 - CLOAKING - RESERVED FOR CLOAKED BIOS USE UNDER WINDOWS
	AX = function (000Ch-001Fh)

INT 2C P - Cloaking v1.01 - "Simulate_Shell_Event"
	AX = 000Fh
	ECX = event code (see #02560)
	DX = subfunction for event
	EDX high word = boost value (see #02561)
	SI:EDI -> completion procedure
Return: CF clear if successful (event scheduled)
	CF set on error
Note:	this function is only available while MS Windows is running
SeeAlso: AX=0011h,AX=0012h,INT 2F/AX=1605h,INT 2F/AX=4310h"Cloaking"

(Table 02560)
Values for Cloaking shell event code:
 0414h	Hot key event
	subevent 0000h: Alt-Space
	subevent 0001h: Alt-Enter
	subevent 0002h: Dir-VM
 0415h	Switch context
	subevent 0000h for DOS VM context, nonzero for System VM context
 0416h	Clipboard event
 0417h	Termination event
	subevent 0000h for normal termination, nonzero for error
 0418h	Display message
	subevent 0000h for normal message, nonzero for system model ASAP
 0419h	Crash
 041Ah	Paste complete
	subevent 0000h: normal
	subevent 0001h: cancelled by user
	subevent 0002h: cancelled
 041Bh	Contention event
 041Ch	Screen switch
	subevent 0000h: forward
	subevent 0001h: back
 041Dh	Filesystem change
 041Eh	Check Focus
 041Fh	Panic

Bitfields for boost value:
Bit(s)	Description	(Table 02561)
 0	boost system VM until focus changes
 1	boost system VM on Switcher screen
 2	boost system VM until response
 3	boost system VM during clipboard activity
 4	boost system VM during print screen
 5	boost system VM during update

INT 2C P - Cloaking v1.01 - "Switch_VMs_and_Call_back"
	AX = 0011h
	EBX = handle of VM to be made active
	SI:EDI -> 32-bit FAR completion procedure
Return: CF clear if successful (scheduled)
	CF set on error
Notes:	this function is only available while MS Windows is running
	the completion procedure is called with CF clear if the specified
	  VM has been made active, or with CF set on error
SeeAlso: AX=000Fh,AX=0012h

INT 2C P - Cloaking v1.01 - "Query_Current_VM"
	AX = 0012h
Return: CF clear
	EBX = handle of active VM
	ESI = handle of system VM
	ECX = VM status flags (see #02562)
	EDX = shell flags (see #02563)
Note:	this function is only available while MS Windows is running in enhanced
	  mode
SeeAlso: AX=000Fh,AX=0011h,AX=0013h

Bitfields for VM status flags:
Bit(s)	Description	(Table 02562)
 0	in exclusive mode
 1	runs in background
 2	being created
 3	suspended
 4	not executable
 5	executing in protected mode
 6	contains PM application
 7	32-bit PM application
 8	called from VxD
 9	high priority background
 10	blocked on semaphore
 11	awakening
 12	has pageable V86
 13	has locked V86
 14	is scheduled
 15	idle
 16	closing

Bitfields for shell flags:
Bit(s)	Description	(Table 02563)
 2	windowed
 5	Alt-Tab reserved
 6	Alt-Esc reserved
 7	Alt-Space reserved
 8	Alt-PrtSc reserved
 9	Alt-Enter reserved
 10	Alt-PrtSc reserved
 11	PrtSc reserved
 12	polling enabled
 13	no HMA
 14	has shortcut key
 15	locked EMS handles
 16	locked XMS handles
 17	fast paste enabled
 18	locked V86 memory
 30	close-on-exit enabled

INT 2C P - Cloaking v1.01 - "Issue_System_Modal_Message"
	AX = 0013h
	EDX = message box flags (see #02564)
	DS:ECX -> ASCIZ message text
	DS:EDI -> ASCIZ caption
Return: CF clear
	EAX = response code
Note:	this function is only available while MS Windows is running in enhanced
	  mode
SeeAlso: AX=000Fh,AX=0012h

Bitfields for message box flags:
Bit(s)	Description	(Table 02564)
 3-0	response codes (see #02565)
 7-4	icon codes
	1 = Warning hand
	2 = exclamation mark
	4 = asterisk
 9-8	default response (0 = first button, 1 = second, 2 = third)
 12	message is system model
 15	don't change focus
 29	hang with interrupts enabled
 30	do not window
 31	execute ASAP

(Table 02565)
Values for response codes:
 00h	OK
 01h	OK, Cancel
 02h	Abort, Retry, Ignore
 03h	Yes, No, Cancel
 04h	Yes, No
 05h	Retry, Cancel

INT 2C P - Cloaking v1.01 - GET INT 2C API HANDLER ENTRY POINT
	AX = 001Dh
Return: CF clear
	DX:EBX = selector:offset of Cloaking host INT 2C handler
Desc:	get the Cloaking host's entry point to bypass any other programs
	  which may have hooked INT 2C in protected mode
Note:	the returned entry point must be called with a simulated INT, i.e.
	  a PUSHD must precede the far call to the handler
SeeAlso: INT 2F/AX=4310h"Cloaking"

INT 2C P - Cloaking v1.01 - CLEAR CRITICAL SECTION
	AX = 001Eh
Return: CF clear
Desc:	allow MS Windows to switch to another VM after having prevented it
	  by invoking a critical section
SeeAlso: AX=001Fh,INT 15/AX=101Ch,INT 2F/AX=1682h

INT 2C P - Cloaking v1.01 - SET CRITICAL SECTION
	AX = 001Fh
Return: CF clear
Desc:	prevent MS Windows from switching to another VM
SeeAlso: AX=001Eh,INT 15/AX=101Bh,INT 2F/AX=1681h

INT 2C P - Cloaking - GET SIZE OF PROTECTED-MODE STATE
	AX = 0020h
Return: EAX = number of bytes required for storing state
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0021h,AX=0022h

INT 2C P - Cloaking - SAVE PROTECTED-MODE STATE
	AX = 0021h
	ES:EDI -> buffer for protected-mode state
Return: CF clear
	buffer filled
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0020h,AX=0022h

INT 2C P - Cloaking - RESTORE PROTECTED-MODE STATE
	AX = 0022h
	DS:ESI -> buffer containing previously-saved protected-mode state
Return: CF clear if successful
	    state restored
	CF set on error (invalid buffer contents)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0020h,AX=0021h

INT 2C P - Cloaking - ISSUE PROTECTED-MODE XMS CALL
	AX = 0023h
Notes:	not currently implemented--NOP in RM386 v6.00
	this function was first introduced with RM386 (RAM-MAN/386) v6.00

INT 2C P - Cloaking - SET V86-MODE STACK
	AX = 0024h
	DX:EBX = new value for V86-mode SS:ESP
Return: nothing
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00

INT 2C P - Cloaking - CALL V86-MODE PROCEDURE
	AX = 0025h
	DS:EBX -> client register structure (see #02559)
Return: CF clear if successful
	    client register structure updated
	CF set if no more nested procedure call space available
Notes:	this call uses the V86-mode stack supplied in the client structure, and
	  calls the routine specified by CS:IP in the client structure
	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0026h,AX=0027h,INT 31/AX=0301h

INT 2C P - Cloaking - CALL V86-MODE INTERRUPT HANDLER
	AX = 0026h
	DS:EBX -> client register structure (see #02559)
	CX = interrupt number
Return: CF clear if successful
	    client register structure updated
	CF set if no more nested procedure call space available
Notes:	this call uses the V86-mode stack supplied in the client structure
	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0025h,AX=0027h,INT 31/AX=0300h

INT 2C P - Cloaking - CHAIN TO V86-MODE INTERRUPT HANDLER
	AX = 0027h
	DS:EBX -> client register structure (see #02559)
Return: CF clear if successful
	    client register structure updated
	CF set if no more nested procedure call space available
Notes:	this call uses the V86-mode stack supplied in the client structure,
	  and jumps to the address specified by CS:IP in the client structure
	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0025h,AX=0026h

INT 2C P - Cloaking - GET ESP0 FROM TSS
	AX = 0028h
Return: CF clear
	EAX = TSS's ESP0
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00, the
	  memory manager included in Helix Software's Netroom

INT 2C P - Cloaking - SET SECONDARY STACK
	AX = 0029h
	DX:EBX = new value for SS:ESP of ring 3 secondary stack
Return: CF clear
Desc:	inform RM386 of the ring 3 interrupt stack location
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00

INT 2C P - Cloaking - SET 8259 IRQ BASE VECTORS
	AX = 002Ah
	BL = base vector of master interrupt controller
	CL = base vector of slave interrupt controller
Notes:	this call merely informs RM386 that the caller has changed the
	  interrupt mappings
	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: INT 67/AX=DE0Bh

INT 2C P - Cloaking - PROTECTED-MODE VIRTUAL DMA SERVICES
	AX = 002Bh
	CH = 81h
	CL = subfunction (02h-0Ch)
	other registers as appropriate for subfunction
Return: varies by function
	CF set on error
Notes:	these functions are equivalent to the INT 4B/AX=81xxh subfunctions
	  with the same numbers
	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: INT 4B/AX=8102h,INT 4B/AX=810Ch

INT 2C P - Cloaking - GET PORT-TRAPPING PASSALONG
	AX = 002Ch
Return: CF clear
	DX:EBX = current I/O trapping passalong address
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0008h,AX=002Dh

INT 2C P - Cloaking - SET PORT-TRAPPING PASSALONG
	AX = 002Dh
	DX:EBX = new I/O trapping passalong address (see #02566)
Return: CF clear
Notes:	RM386 calls the passalong address whenever an access to a monitored
	  I/O port is attempted; the handler should check whether it is a port
	  that it is interested in, and if not call the previous passalong
	  address (which was retrieved with AX=002Ch before installing the
	  new handler)
	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0009h,AX=002Ch,INT 67/AX=5DEAh

(Table 02566)
Values Cloaking port-trapping passalong address is called with:
	EAX = CS:IP of faulting instruction (unless executing in protected-mode
		ring 3)
	SS:EBX -> caller register structure (see #02559)
		check EFLAGS V86-mode bit for type
	CX = first two bytes of I/O instruction which was trapped
	DX = port to which I/O is being performed
	CF clear
Return: CF clear if RM386 should perform I/O operation
	CF set if I/O should be skipped
Note:	RM386 skips the trapped I/O instruction, so the passalong handler
	  should not modify the client CS:EIP

INT 2C P - Cloaking - TRAP I/O PORT
	AX = 002Eh
	DX = port number to trap
Return: CF clear if successful
	CF set on error (port out of range or reserved)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=002Fh,AX=0030h

INT 2C PU - Cloaking - UNTRAP I/O PORT
	AX = 002Fh
	DX = port number for which to cancel trapping
Return: CF clear if successful
	CF set on error (port out of range or reserved)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=002Eh,AX=0030h

INT 2C PU - Cloaking - GET TRAPPING STATE OF SPECIFIED PORT
	AX = 0030h
	DX = port number
Return: CF clear if successful
	   BX = current state (0000h not trapped, 0001h trapped)
	CF set on error (port out of range or reserved)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=002Eh,AX=002Fh

INT 2C PU - RM386 v6.00 - BUG
	AX = 0031h
Program: RM386 (RAM-MAN/386) is the memory manager included in Helix
	  Software's Netroom
Note:	due to a fencepost error, RM386 v6.00 will branch unpredictably if
	  invoked with this function

INT 2C P - Cloaking v1.01 - ALLOCATE V86 CALLBACK
	AX = 0031h
	DX:EBX = CS:EIP of protected-mode routine to be invoked by callback
Return: CF clear if successful
	    EBX = CS:IP of V86-mode callback handler
	CF set on error
SeeAlso: AX=0032h

INT 2C P - Cloaking v1.01 - FREE V86 CALLBACK
	AX = 0032h
	EBX = CS:IP of V86-mode callback handler
Return: CF clear if successful
	CF set on error
	    AX = error code
		0005h invalid callback address
		0006h callback already free
SeeAlso: AX=0032h

INT 2C P - Cloaking v1.01 - REGISTER CLOAKING CLIENT
	AX = 0033h
	DS:EDX -> client registration structure (see #02567)
Return: CF clear if successful
	CF set on error (linked list corrupt)
SeeAlso: AX=0034h,#02778 at INT 2F/AX=4310h"Cloaking"

Format of client registration structure:
Offset	Size	Description	(Table 02567)
 00h	PWORD	link to next structure
 06h	PWORD	link to previous structure
 0Ch  2 BYTEs	client version (major, minor)
 0Eh 20 BYTEs	client name
 22h	DWORD	physical address of client start
 26h	DWORD	client's total size in bytes
Note:	the link area should not be modified once the structure has been
	  used for the registration call

INT 2C P - Cloaking v1.01 - UNREGISTER CLOAKING CLIENT
	AX = 0034h
	DS:EDX -> client registration structure (see #02567)
Return: CF clear if successful
	CF set on error (linked list corrupt)
Note:	the client must unregister before freeing the XMS block containing
	  its registration structure(s)
SeeAlso: AX=0033h,#02778 at INT 2F/AX=4310h"Cloaking"

INT 2D - DOS 2+ - RESERVED
Note:	this vector is not used in DOS versions <= 6.00, and points at an IRET
BUG:	RM386 v6.00-6.02 (as distributed with Helix's Netroom v3.x) contains
	  a stack bug in its protected-mode INT 2D handler which causes a crash
	  when INT 2D is invoked from V86 mode

INT 2D - ALTERNATE MULTIPLEX INTERRUPT SPECIFICATION (AMIS) [v3.6]
	AH = multiplex number
	AL = function
	    00h installation check
	    01h get private entry point
	    02h uninstall
	    03h request popup
	    04h determine chained interrupts
	    05h get hotkey list
	    06h get device-driver information
	    07h-0Fh reserved for future enhancements
		Return: AL = 00h (not implemented)
	    other  application-dependent
	other registers vary by function (also see individual entries below)
Return: varies by function
Notes:	programs should not use fixed multiplex numbers; rather, a program
	  should scan all multiplex numbers from 00h to FFh, remembering the
	  first unused multiplex in case the program is not yet installed.
	  For multiplex numbers which are in use, the program should compare
	  the first 16 bytes of the signature string to determine whether it
	  is already installed on that multiplex number.  If not previously
	  installed, it should use the first free multiplex number.
	functions other than 00h are not valid unless a program is installed
	  on the selected multiplex number
	to be considered fully compliant with version 3.6 of the specification,
	  programs must implement at least functions 00h, 02h (no resident
	  uninstall code required), and 04h (return value 04h).	 TSRs that
	  provide hotkeys with which the user can activate them must also
	  implement function 05h.  TSRs which provide DOS device drivers must
	  also implement function 06h.	The absolute minimum fully-compliant
	  implementation has an overhead of 64 bytes (80 bytes with function
	  05h) plus 22 bytes per hooked interrupt (for the interrupt sharing
	  protocol header and hook list entry).
	the signature string and description may be used by memory mappers
	  to display the installed programs
	to be considered fully compliant, users of this specification must
	  adhere to the IBM interrupt sharing protocol (see #02568), which will
	  permit removal of TSRs in arbitrary order and interrupt handler
	  reordering.  All TSRs following this specification should be
	  removable unless they are loaded from CONFIG.SYS, though they need
	  not keep the code for removing themselves resident; it is acceptable
	  for a separate program to perform the interrupt unhooking and
	  memory-freeing steps of removal.
	A sample public-domain implementation including example TSRs and
	  utility programs may be found in a separate package distributed as
	  AMISLnnn.ZIP (AMISL092.ZIP as of this writing).
	Please let me know if you choose to follow this proposal.  The
	  signature and a list of the private API calls you use would be
	  appreciated, as well.
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h
SeeAlso: INT 2D/AL=05h,INT 2D/AL=06h,INT 2F"NOTES"

Format of interrupt sharing protocol interrupt handler entry point:
Offset	Size	Description	(Table 02568)
 00h  2 BYTEs	short jump to actual start of interrupt handler, immediately
		  following this data block (EBh 10h)
 02h	DWORD	address of next handler in chain
 06h	WORD	signature 424Bh
 08h	BYTE	EOI flag
		00h software interrupt or secondary hardware interrupt handler
		80h primary hardware interrupt handler (will issue EOI to
		      interrupt controller)
 09h  2 BYTEs	short jump to hardware reset routine
		must point at a valid FAR procedure (may be just RETF)
 0Bh  7 BYTEs	reserved (0) by IBM for future expansion
Note:	when chaining to the prior handler, the interrupt handler must perform
	  an indirect jump/call using the address at offset 02h in the
	  ISP header.  This permits another AMIS TSR to hook itself into
	  the chain at a position other than as the first handler to receive
	  an interrupt.
SeeAlso: INT F1/AH=01h"Common ISDN API",INT F1/AH=06h"CAPI",#04068

INT 2D - AMIS v3.0+ - INSTALLATION CHECK
	AL = 00h
	AH = multiplex number for program
Return: AL = 00h if free
	AL = FFh if multiplex number in use
	    CX = binary version number (CH = major, CL = minor)
	    DX:DI -> signature string (see #02569) identifying the program
		  using the multiplex number
SeeAlso: INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h
Index:	installation check;Alternate Multiplex Interrupt Specification
Index:	installation check;AMIS|installation check;FASTMOUS
Index:	installation check;SPELLER|installation check;Monitor
Index:	installation check;NOLPT|installation check;NOTE
Index:	installation check;RBkeyswp|installation check;SWITCHAR
Index:	installation check;VGABLANK|installation check;EATMEM
Index:	installation check;RECALL|installation check;XPTR2

Format of AMIS signature string:
Offset	Size	Description	(Table 02569)
 00h  8 BYTEs	blank-padded manufacturer's name (possibly abbreviated)
 08h  8 BYTEs	blank-padded product name
 10h 64 BYTEs	ASCIZ product description (optional, may be a single 00h)
Note:	it is not necessary to reserve a full 64 bytes for the description,
	  just enough to store the actual ASCIZ string
SeeAlso: #02570

(Table 02570)
Values for AMIS signatures known to be in use:
 'Byrial J' 'EKLAVO  '	permits keyboard entry of Esperanto accented letters
 'CoveSoft' 'Burnout+'	shareware screen saver Burnout Plus
 'Crynwr  ' 'SPELLER '	TSR spelling-checker
 'CPH1995 ' 'CDTSR   '	resident CD-Audio player
 'CPH1996 ' 'DSAPI   '
 'CSJewell' 'Modula3L'	Curtis Jewell's Modula-3 compiler (non-TSR)
 'Cubbi...' 'ASCII...'	Example ASCII code view/enter TSR by Sergey Zubkov
 'Cubbi...' 'ScrnGrab'	Example screen grabber by Sergey Zubkov
 'DAISYCHA' 'INDRIVER'	Advanced Parallel Port daisy chain driver (vendor name
			  in product description field, if desired)
			(see also INT 2D/AL=DCh)
 'DTown SD' 'DTU     '	DTown Software Development's DTown Utilities
			(see also INT 2D/AL=20h)
 'ECLIPSE ' 'PLUMP   '	Eclipse Software's printer and plotter spooler
 'GraySoft' 'GIPC    '	GraySoft's Inter-Process Communications driver
 'heathh  ' 'Monitor '
 'Helge O '		TSRs by Helge Olav Helgesen
 'IVALM SK' 'lmkey   '	Russian keyboard driver by Sergey Khabarov
 'IVALM SK' 'lmrus   '	Russian screen	 driver by Sergey Khabarov
 'J. Berry' 'RATSR   '	RemoteAccess Network Manager workstation module
 'JWB	  ' 'RAMLIGHT'	James Birdsall's on-screen RAMdisk activity indicator
 'M Better' 'iHPFS   '	Marcus Better's HPFS filesystem driver for DOS
 'M. Paul ' 'FREEVER '	DOS version-faking TSR by Matthias Paul
 'Nildram ' 'ST	     '	Screen Thief graphics screen grabber
 'NoBrain ' 'FlatReal'	Flat real mode monitor by Sergei Shtylyov
 'NoBrain ' 'Grabber '	Frame grabber drivers by Sergei Shtylyov
 'NoBrain ' 'SqrModes'	TSR providing some non-standard video modes
			by Sergei Shtylyov
 'Pino Nav' 'ALTMENU '	activate any program's menu bar by pressing Alt key
 'Pino Nav' 'Keybit  '	Pino Navato's KEYBIT Lite Italian keyboard driver v4+
 'PowrQuot' 'CAPRILOG'
 'PowrQuot' 'CAPRITSR'
 'PowrQuot' 'CAPRIWIN'
 'R-Ware  ' 'dLite   '	run-time data decompression TSR
 'Ralf B  ' 'disaXXYY'	RBdisabl -- disable key scancode XX w/ shift states YY
 'Ralf B  ' 'DUALVGA '	dual-VGA support, screen blanker, and DPMS driver
 'Ralf B  ' 'FASTMOUS'	example TSR included with sample AMIS library code
 'Ralf B  ' 'NoBreak '	disable Ctrl-@, Ctrl-C, and Ctrl-Break keys
 'Ralf B  ' 'NOLPT n '	example TSR -- turn LPTn into bit-bucket
 'Ralf B  ' 'NOTE    '	example TSR -- popup note-taker
 'Ralf B  ' 'RBclock '	RBclock -- on-screen real-time clock
 'Ralf B  ' 'RBclockE'	RBclock -- on-screen elapsed-time clock
 'Ralf B  ' 'RBdvorak'	Dvorak keyboard mapping w/ opt Esc/~, LCtrl/CapsLk swap
 'Ralf B  ' 'RBkcount'	display count of keystrokes on screen
 'Ralf B  ' 'RBkeyswp'	RBkeyswap v3.0+ -- swap Esc/~ and LCtrl/CapsLock keys
 'Ralf B  ' 'RBnoboot'	disable Ctrl-Alt-Del key combination
 'Ralf B  ' 'ShftCaps'	require Shift-CapsLock to turn on CapsLock
 'Ralf B  ' 'ShftNumL'	require Shift-NumLock to turn off NumLock
 'Ralf B  ' 'SWITCHAR'	example TSR -- add switchar() support removed from DOS5
 'Ralf B  ' 'VGABLANK'	VGA-only screen blanker
 'Ralf B  ' 'WINTAME '	yield CPU when program in Win95 DOS box is idle
 'Sally IS' 'Mdisk   '	removeable, resizeable RAMdisk
 'Sally IS' 'Scr2Tex '	screen dumper with output in (La)Tex format
 'SRT	  ' 'STOPBOOT'	reboot preventer by Steve Talbot
 'Thaco	  ' 'NEST    '	Eirik Pedersen's programmer's delimiter matcher
 'TifaWARE' 'EATMEM  '	George A. Theall's public domain memory restrictor for
			testing programs (v1.1+)
 'TifaWARE' 'RECALL  '	public domain commandline editor and history (v1.2+)
 'Todd	  ' 'XPTR2   '	PC-to-Transputer interface by Todd Radel
 'WlkngOwl' 'NoiseSYS'	NOISE.SYS random-number generator
SeeAlso: #02569

INT 2D - AMIS v3.0+ - GET PRIVATE ENTRY POINT
	AL = 01h
	AH = multiplex number for program
Return: AL = 00h if all API calls via INT 2D
	AL = FFh if entry point supported
	    DX:BX -> entry point for bypassing interrupt chain
Note:	this function is not valid unless a program is installed on the
	  specified multiplex number; use INT 2D/AL=00h to check
SeeAlso: INT 2D/AL=00h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h
Index:	entry point;Alternate Multiplex Interrupt|entry point;AMIS

INT 2D - AMIS v3.0+ - UNINSTALL
	AL = 02h
	AH = multiplex number for program
	DX:BX = return address for successful uninstall (may be	ignored by TSR)
Return: AL = status
	    00h not implemented (makes TSR non-compliant with specification)
	    01h unsuccessful
	    02h can not uninstall yet, will do so when able
	    03h safe to remove, but no resident uninstaller
		  (TSR still enabled)
		BX = segment of memory block with resident code
	    04h safe to remove, but no resident uninstaller
		  (TSR now disabled)
		BX = segment of memory block with resident code
	    05h not safe to remove now, try again later
	    06h disabled, but can not be removed from memory
		  because loaded from CONFIG.SYS
	    07h safe to remove, but no resident device-driver
		  uninstaller.	Caller must unlink device
		  drivers from DOS device chain as well as
		  unhooking interrupts and freeing memory
		BX = segment of memory block with resident code
	    FFh successful
	return at DX:BX with AX destroyed if successful and TSR honors
	  specific return address
Note:	this function is not valid unless a program is installed on the
	  specified multiplex number; use INT 2D/AL=00h to check
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=03h,INT 2D/AL=04h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h
Index:	uninstall;Alternate Multiplex Interrupt Specification|uninstall;AMIS

INT 2D - AMIS v3.0+ - REQUEST POP-UP
	AL = 03h
	AH = multiplex number for program
Return: AL = status
	    00h not implemented or TSR is not a pop-up
	    01h can not pop up at this time, try again later
	    02h can not pop up yet, will do so when able
	    03h already popped up
	    04h unable to pop up, user intervention required
		BX = standard reason code
		    0000h unknown failure
		    0001h interrupt chain passes through memory
			  which must be swapped out to pop up
		    0002h swap-in failed
		CX = application's reason code if nonzero
	    FFh TSR popped up and was exited by user
		BX = return value
		    0000h no return value
		    0001h TSR unloaded
		    0002h-00FFh reserved
		    0100h-FFFFh application-dependent
Note:	this function is not valid unless a program is installed on the
	  specified multiplex number; use INT 2D/AL=00h to check
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=04h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h

INT 2D - AMIS v3.0+ - DETERMINE CHAINED INTERRUPTS
	AL = 04h
	AH = multiplex number for program
	BL = interrupt number (except 2Dh)
Return: AL = status
	    00h not implemented (makes TSR non-compliant with specification)
	    01h (obsolete) unable to determine
	    02h (obsolete) interrupt hooked
	    03h (obsolete) interrupt hooked, address returned
		DX:BX -> TSR's interrupt BL handler
	    04h list of hooked interrupts returned
		DX:BX -> interrupt hook list (see #02571)
	    FFh interrupt not hooked
Notes:	BL is ignored if the TSR returns AL=04h; in that case, the caller
	  needs to scan the return list rather than making additional calls
	  to this function.  If the return is not 00h or 04h, then the caller
	  must cycle through the remaining interrupt numbers it wishes to
	  check.
	return values 01h through 03h may not be used by AMIS v3.6-compliant
	  programs; they are included here solely for compatibility with
	  version 3.3, though they were probably never used in any
	  implementation
	for return values 01h through 03h, since INT 2D is known to be hooked,
	  the resident code need not test for BL=2Dh (to minimize its size),
	  and the return value is therefore undefined in that case.
	this function is not valid unless a program is installed on the
	  specified multiplex number; use INT 2D/AL=00h to check
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h

Format of AMIS interrupt hook list [array]:
Offset	Size	Description	(Table 02571)
 00h	BYTE	interrupt number (last entry in array is 2Dh)
 01h	WORD	offset within hook list's segment of the interrupt handler
		this will point at the initial short jump of the interrupt
		  sharing protocol header (see #02568)
SeeAlso: #02572

INT 2D - AMIS v3.5+ - GET HOTKEYS
	AL = 05h
	AH = multiplex number for program
Return: AL = status
	    00h not implemented
	    FFh supported
		DX:BX -> hotkey list (see #02572)
Notes:	this function is not valid unless a program is installed on the
	  specified multiplex number; use INT 2D/AL=00h to check
	programs which provide hotkeys are required to provide this function
	  to be fully compliant with this specification
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h
SeeAlso: INT 2D/AL=06h

Format of AMIS hotkey list:
Offset	Size	Description	(Table 02572)
 00h	BYTE	type of hotkey checking (see #02573)
 01h	BYTE	number of hotkeys (may be zero if TSR can disable hotkeys)
 02h 6N BYTEs	array of hotkey definitions
		(one per hotkey, first should be primary hotkey)
		Offset	Size	Description
		 00h	BYTE	hotkey scan code (00h/80h if shift states only)
				hotkey triggers on release if bit 7 set
		 01h	WORD	required shift states (see #02574)
		 03h	WORD	disallowed shift states (see #02574)
		 05h	BYTE	hotkey flags (see #02575)
Notes:	except for bit 7, the shift states correspond exactly to the return
	  values from INT 16/AH=12h.  A set bit in the required states word
	  indicates that the corresponding shift state must be active when the
	  hotkey's scan code is received for the hotkey to be recognized; a
	  clear bit means that the corresponding state may be ignored.	A set
	  bit in the disallowed shift states word indicates that the
	  corresponding shift state must be inactive.
	for the disallowed-states word, if one of the "either" bits is set,
	  then both the corresponding left bit and right bit must be set
	examples:
		Ctrl-Alt-Del monitoring: 53h 000Ch 0003h 06h
		Alt-key tap (DESQview):	 B8h 0000h 0007h 08h
		Shf-Shf-N (NOTE.COM):	 31h 0003h 000Ch 00h
Index:	hotkeys;AMIS
SeeAlso: #00006

Bitfields for type of AMIS hotkey checking:
Bit(s)	Description	(Table 02573)
 0	checks before chaining INT 09
 1	checks after chaining INT 09
 2	checks before chaining INT 15/AH=4Fh
 3	checks after chaining INT 15/AH=4Fh
 4	checks on INT 16/AH=00h,01h,02h
 5	checks on INT 16/AH=10h,11h,12h
 6	checks on INT 16/AH=20h,21h,22h
 7	reserved (0)
SeeAlso: #02572

Bitfields for AMIS shift states:
Bit(s)	Description	(Table 02574)
 0	right shift pressed
 1	left shift pressed
 2	either control key pressed
 3	either Alt key pressed
 4	ScrollLock active
 5	NumLock active
 6	CapsLock active
 7	either shift key pressed
 8	left control key pressed
 9	left Alt key pressed
 10	right control key pressed
 11	right Alt key pressed
 12	ScrollLock pressed
 13	NumLock pressed
 14	CapsLock pressed
 15	SysReq key pressed
Notes:	if bit 2 is set, either control key may be pressed for the hotkey; if
	  bits 8 and 10 are both set, then both control keys must be pressed.
	  Similarly for bits 3 and 9/11, as well as 7 and 0/1.
	the SysReq key is often labeled SysRq
SeeAlso: #02572,#02575

Bitfields for AMIS hotkey flags:
Bit(s)	Description	(Table 02575)
 0	hotkey chained before processing
 1	hotkey chained after processing
 2	others should pass through this hotkey so that it can be monitored
 3	hotkey will not activate if other keys pressed/released before hotkey
	  press is completed
 4	this key is remapped into some other key
 5	this key is conditionally chained (sometimes passed on, sometimes
	  swallowed)
 6-7	reserved (0)
SeeAlso: #02572,#02574

INT 2D - AMIS v3.6 - GET DEVICE-DRIVER INFORMATION
	AL = 06h
	AH = multiplex number for program
Return: AL = number of device driver headers supplied by prog.
	AH = device-driver flags (see #02576)
	DX:BX -> first device driver header (see #01646)
Program: AMIS is the Alternate Multiplex Interrupt Specification promulgated
	  by Ralf Brown
Notes:	if AL=00h, AH,BX,DX are meaningless and may be destroyed
	this function is not valid unless a program is installed on the
	  specified multiplex number; use INT 2D/AL=00h to check
	programs which provide device drivers are required to support this
	  function to be considered fully compliant with v3.6+ of the
	  specification
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h
SeeAlso: INT 2D/AL=05h

Bitfields for AMIS device-driver information flags:
Bit(s)	Description	(Table 02576)
 0	program loaded from CONFIG.SYS, and thus can not be removed from memory
	(leave clear if unable to determine)
 1	device driver headers have not been linked into DOS device chain
 2	reentrant device driver(s)

INT 2D - RATSR 2.0+ - GET STATUS
	AL = 10h
	AH = AMIS multiplex number for RATSR
Return: AL = status
	    01h listening (no connection)
	    02h receiving	      \
	    03h sending		       > station being monitored
	    04h initializing receive  /
	AH = keyboard lock status (00h unlocked, 01h locked)
Program: RATSR is a utility by James Berry provided with
	  RemoteAccess/Professional, a commercial bulletin board system, that
	  allows remote control of a station over a network
SeeAlso: INT 2D"AMIS"

INT 2D - dLite 1.0+ - GET PARAMETER BLOCK ADDRESS
	AL = 10h
	AH = AMIS multiplex number for dLite
Return: CF clear if successful
	    ES:BX -> parameter block (see #02577)
	CF set on error
Program: dLite is a shareware TSR by Rainer Schuetze which transparently
	  expands compressed files when they are read
SeeAlso: AL=11h"dLite",AL=12h"dLite",INT 21/AX=FEDCh"PCMANAGE"

Format of dLite parameter block:
Offset	Size	Description	(Table 02577)
 00h	BYTE	TSR flags (see #02578)
 01h	WORD	maximum number of programs needing original filesize
 03h	WORD	current number of programs needing original filesize
 05h	WORD	maximum number of files that can be handled by dLite (should
		  be the same as FILES= in CONFIG.SYS)
 07h	WORD	offset (in the same segment as the parameter block) of the
		  table of programs needing the original filesize (8 bytes
		  each,	without path or extension, uppercase, and zero \
		  terminated if	shorter than 8 bytes)

Bitfields for dLite TSR flags:
Bit(s)	Description	(Table 02578)
 0	deny FCB access
 1	dLite sleeping rather than activated
 2	always indicate original filesize when reading directory entries,
	  rather than only for specified programs
 3-7	reserved
SeeAlso: #02577

INT 2D - Burnout Plus v3.00 - GET STATE/CONTROL INFORMATION
	AL = 10h
	AH = AMIS multiplex number for Burnout Plus
Return: AL = 01h
	BX = Burnout Plus status (see #02579)
	CX = record of features loaded (see #02580)
	ES:DI -> Burnout Plus control structure (see #02581)
Program: Burnout Plus is a DOS screen saver from Cove Software
SeeAlso: INT 14/AX=AA01h,INT 2D"AMIS"
Index:	screen saver;Burnout Plus

Bitfields for Burnout Plus status:
Bit(s)	Description	(Table 02579)
 0	screen is blanked
 1	MS Windows is active (Burnout Plus deactivated)
 2-15	reserved

Bitfields for Burnout Plus features loaded/features enabled:
Bit(s)	Description	(Table 02580)
 0	mouse activity monitor
 1	passkey support
 2	password support
 3	continuous clear
 4	software blanking
 5	video activity monitor
 6	disk activity monitor
 7	activating keystroke suppression
SeeAlso: #02581

Format of Burnout Plus control structure:
Offset	Size	Description	(Table 02581)
 00h	BYTE	size of structure in bytes
 01h	WORD	Burnout Plus version
 03h	WORD	screen blanking reset count in clock ticks
 05h	WORD	current countdown value in clock ticks
 07h	BYTE	type of timeout specification
 08h	BYTE	instant-blank hotkey
 09h	WORD	extended status information (see #02582)
		the bits for password, passkey, and software blanking are
		  ignored and cannot be enabled or disabled externally
 0Bh	WORD	features enabled (see #02580)
Note:	all fields except the first two may be modified by external programs
	  to affect the operation of Burnout Plus
Index:	hotkeys;Burnout Plus

Bitfields for extended Burnout Plus status information:
Bit(s)	Description	(Table 02582)
 0	Burnout Plus disabled
 1	force screen to blank on next clock tick
 2	restore screen if currently blanked
 3-15	reserved
Note:	1 and 2 are automatically cleared by Burnout Plus after blanking
	  or restoring the screen
SeeAlso: #02581

INT 2D U - Screen Thief v1.00 - FREE HIGH MEMORY BUFFERS
	AL = 10h
	AH = AMIS multiplex number for Screen Thief
Return: nothing
Program: Screen Thief is a graphics screen grabber
Note:	releases any code and data stored in EMS, DOS UMBs, or XMS UMBs, but
	  does not release the low-memory stub; this may be used to effect a
	  partial uninstall if INT 2D/AL=02h fails
SeeAlso: INT D8"Screen Thief"

INT 2D U - RAMLIGHT v1.0 - GET MONITORING INFORMATION
	AL = 10h
	AH = AMIS multiplex number for RAMLIGHT
Return: ES:BX -> array of fake device driver headers used in monitoring
	CX = number of drives being monitored???

INT 2D - DTown Utilities v1.40+ - EXTENDED API INSTALLATION CHECK
	AL = 10h
Return: AL = FFh
	BL = extended API availability (00h no, 01h API is loaded)
SeeAlso: INT 2D/AL=11h"DTown",INT 2D/AL=20h,INT 2D/AL=50h

INT 2D - CDTSR - GET INTERNAL VARIABLE TABLE
	AL = 10h
	AH = AMIS multiplex number for CDTSR
Return: CX:DX -> CDTSR internal variable structure (see #02583)
Program: CDTSR is a resident audio CD player by Colin Hill
SeeAlso: INT 2D/AL=11h"CDTSR",INT 2D/AL=12h"CDTSR",INT 2D/AL=13h"CDTSR"

Format of CDTSR internal variable structure:
Offset	Size	Description	(Table 02583)
 00h	BYTE	hotkey scan code (see #00006)
 01h	BYTE	hotkey shift states
 02h	BYTE	flag: repeat
 03h	BYTE	flag: custom repeat
 04h	BYTE	flag: background polling
 05h	DWORD	(read-only) internal timing variable
 09h	DWORD	current track play position, in frames
 0Dh	DWORD	current disk play position, in frames
 11h	BYTE	number of entries in track program
 12h	BYTE	index into track program currently playing (FFh if not playing)
 13h 100 BYTEs	track program (each byte contains one track number)
 77h	BYTE	saved cursor end scan line
 78h	BYTE	saved cursor start scan line
 79h	BYTE	currently playing track
 7Ah	BYTE	CD driver media-change flag
 7Bh	WORD	video base segment during last popup
 7Dh	WORD	video page offset during last popup
 7Fh	BYTE	currently-selected track
 80h	DWORD	begin of custom repeat, in frames
 84h	DWORD	end of custom repeat, in frames
 88h	WORD	track program index of top list item

INT 2D - KEYBIT Lite v5+ - GET POINTER TO STATUS BYTE
	AL = 10h
	AH = AMIS multiplex number for KEYBIT Lite
Return: DX:BX -> status byte (see #02584)
Program: KEYBIT Lite is an enhanced Italian keyboard driver by Pino Navato.
SeeAlso: INT 2D"AMIS"

Bitfields for KEYBIT Lite status byte:
Bit(s)	Description	(Table 02584)
 7	KEYBIT Lite active
 6	E-mail support active
 5-0	reserved
Notes:	E-mail support is one of the original features of KEYBIT Lite.	It is
	  the automatic conversion of the 8-bits ASCII chars produced by some
	  keys available on Italian keyboards to couples of 7-bits chars.
	Message editors should always enable e-mail support, they should also
	  restore its original status before exiting.
	The user can change both status bits by hotkeys.

INT 2D - ALTMENU - GET POINTER TO KEY CODE
	AL = 10h
	AH = AMIS multiplex number for signature 'Pino Nav' 'ALTMENU '
Return: DX:BX -> WORD key code to insert in keyboard buffer on Alt-key tap
Program: Pino Navato's freeware ALTMENU permits activating the menu bar of
	  any program by pressing the Alt key alone.
Notes:	The value in the key code word will be returned in AX by a call to
	  INT 16/AH=00h after the Alt key is pressed by itself
	ALTMENU may be disabled by setting the key code equal to 0000h
SeeAlso: INT 16/AH=00h,INT 2D"AMIS"

INT 2D - dLite 1.0+ - CHECK FOR dPressed FILE AND GET ORIGINAL SIZE
	AL = 11h
	AH = AMIS multiplex number for dLite
	BX = file handle
Return: CF clear if successful
	    DX:AX = size of uncompressed file
	CF set on error (not dPressed file)
SeeAlso: AL=10h"dLite",AL=12h"dLite"

INT 2D - DTown Utilities v1.40+ - UTILITY INSTALLATION CHECK
	AL = 11h
	BL = function
	    00h get number of installed utilities
		Return: BL = number of utilities
	    01h get installed utilities
		DX:DI -> buffer containing one byte for each utility
		Return: DX:DI buffer filled with flags (0=no,1=yes) indicating
			  whether the corresponding utility is loaded
Return: AL = FFh if supported
Note:	this function is only available if the extended API has been installed
	  in the resident portion
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h

INT 2D - CDTSR - REPROGRAM CDTSR
	AL = 11h
	AH = AMIS multiplex number for CDTSR
Return: nothing
Program: CDTSR is a resident audio CD player by Colin Hill
Desc:	reprograms CDTSR based on the values in the internal variable
	  structure (see #02583), which may have been changed by an application
SeeAlso: INT 2D/AL=10h"CDTSR",INT 2D/AL=12h"CDTSR",INT 2D/AL=13h"CDTSR"

INT 2D - dLite 1.0+ - CHECK FOR dPressed FILE AND GET COMPRESSED SIZE
	AL = 12h
	AH = AMIS multiplex number for dLite
	BX = file handle
Return: CF clear if successful
	    DX:AX = size of compressed file
	CF set on error (not dPressed file)
SeeAlso: AL=10h"dLite",AL=11h"dLite"

INT 2D - CDTSR - DISABLE POPUP
	AL = 12h
	AH = AMIS multiplex number for CDTSR
Return: nothing
SeeAlso: INT 2D/AL=10h"CDTSR",INT 2D/AL=11h"CDTSR",INT 2D/AL=13h"CDTSR"

INT 2D - FREEVER - GET ORIGINAL DOS VERSION INFO
	AL = 12h
	AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
	    BH = major DOS version
	    BL = minor DOS version
	    CH = DOS version flag
	    CL = OEM number
	    DH = major DR DOS version number (FFh if unknown)
	    DL = minor DR DOS version number (FFh if unknown)
Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar
	  to SETVER for any DOS-compatible OS, written by Matthias Paul
SeeAlso: INT 2D/AL=13h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=17h"FREEVER"

INT 2D - CDTSR - ENABLE POPUP
	AL = 13h
	AH = AMIS multiplex number for CDTSR
Return: nothing
Program: CDTSR is a resident audio CD player by Colin Hill
SeeAlso: INT 2D/AL=10h"CDTSR",INT 2D/AL=11h"CDTSR",INT 2D/AL=12h"CDTSR"

INT 2D - FREEVER - SET VERSION NUMBERS
	AL = 13h
	AH = AMIS multiplex number for FREEVER
	BH = new major DOS version
	BL = new minor DOS version
	CH = new DOS version flag
	CL = new DOS revision number
	DH = new OEM number
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=15h"FREEVER",INT 2D/AL=17h"FREEVER"

INT 2D - FREEVER - ENABLE TSR
	AL = 14h
	AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=15h"FREEVER",INT 2D/AL=16h"FREEVER"

INT 2D - FREEVER - DISABLE TSR
	AL = 15h
	AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=16h"FREEVER"

INT 2D - FREEVER - GET TSR STATUS
	AL = 16h
	AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
	    BL = status
		01h resident and active
		02h resident and inactive
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=15h"FREEVER",INT 2D/AL=17h"FREEVER"

INT 2D - FREEVER - GET TaskMAX STATUS AT INSTALLATION
	AL = 17h
	AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
	    BL = status
		00h if TaskMAX not loaded before SETDRVER
		FFh if TaskMAX was loaded before SETDRVER
Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar
	  to SETVER for any DOS-compatible OS, written by Matthias Paul
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=16h"FREEVER"

INT 2D - DTown Utilities v1.40+ - GET POP-UP HANDLER ADDRESS
	AL = 20h
Return: AL = FFh if available
	    DX:DI -> DTU popup-handler
Program: DTown Utilities is a freeware programmer's utility TSR by Jeroen van
	  Disseldorp
Note:	this function is only available if the extended API has been installed
	  in the resident portion
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=21h,INT 2D/AL=50h,INT 2D/AL=51h
SeeAlso: INT 03"DTown"

INT 2D - DTown Utilities v1.40+ - POP UP
	AL = 21h
	BL = which utility to bring up
	    00h active utility
	    01h help screen
	    0Ah ASCII table
	    0Bh memory view
	    0Ch CPU status
	    0Dh calculator
	    0Eh miscellaneous
	    0Fh file viewer
	    10h disassembler
Return: AL = status
	    00h already active
	    FFh popped up successfully
	BX = 0000h
Note:	this function is only available if the extended API has been installed
	  in the resident portion
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=50h

INT 2D - DTown Utilities v1.40+ - MEMORY VIEW SET ADDRESS
	AL = 50h
	CX:DX = new address for start of memory view utility's display
Note:	this function is only available if the extended API has been installed
	  in the resident portion
Return: AL = FFh if supported
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=21h,INT 2D/AL=51h

INT 2D - DTown Utilities v1.40+ - MEMORY VIEW SET REFERENCE
	AL = 51h
	BL = reference ("bookmark") number
	CX:DX = new address for reference
Return: AL = status
	    00h invalid index
	    FFh reference set
Note:	this function is only available if the extended API has been installed
	  in the resident portion
Program: DTown Utilities is a shareware programmer's utility TSR by Jeroen van
	  Disseldorp
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=50h

INT 2D C - DAISY.SYS - BROADCAST: CHAIN RESCANNED
	AL = DCh
	AH = AMIS multiplex number for signature 'DAISYCHA' 'INDRIVER'
	DL = LPT Port Rescanned
Program: DAISY.SYS is a daisy chain manager for parallel port peripherals
	  conforming to the IEEE 1284.3 Committee's daisy chain specification.
Desc:	This Broadcast is sent whenever daisy chain IDs are reassigned to
	  warn parallel port device drivers that their daisy chain ID may
	  have been changed.
Note:	This function is a callout from DAISY.SYS, NOT a call into DAISY.SYS
SeeAlso: INT 17/AX=0200h"Enhanced Parallel Port",#00633,#02570

INT 2E U - DOS 2+ - PASS COMMAND TO COMMAND INTERPRETER FOR EXECUTION
	DS:SI -> commandline to execute (see #02585)
Return: all registers except CS:IP destroyed
	AX = status (4DOS v4.0)
	   0000h successful
	   FFFFh error before processing command (not enough memory, etc)
	   other error number returned by command
Notes:	this call allows execution of arbitrary commands (including COMMAND.COM
	  internal commands) without loading another copy of COMMAND.COM
	if COMMAND.COM is the user's command interpreter, the primary copy
	  executes the command; this allows the master environment to be
	  modified by issuing a "SET" command, but changes in the master
	  environment will not become effective until all programs descended
	  from the primary COMMAND.COM terminate
	since COMMAND.COM processes the string as if typed from the keyboard,
	  the transient portion needs to be present, and the calling program
	  must ensure that sufficient memory to load the transient portion can
	  be allocated by DOS if necessary
	results are unpredictable if invoked by a program run from a batch file
	  because this call is not reentrant and COMMAND.COM uses the same
	  internal variables when processing a batch file
	hooked but ignored by 4DOS v3.0 COMMAND.COM replacement unless SHELL2E
	  has been loaded
	the MS-DOS 5 Programmer's Reference calls this "Reload Transient"

Format of DOS commandline:
Offset	Size	Description	(Table 02585)
 00h	BYTE	length of command string, not counting trailing CR
 01h	var	command string
  N	BYTE	0Dh (CR)

INT 2E UP - Windows NT - NATIVE API
	EAX = function number (see #02586)
	EDX = address of parameter block
Return: ???

(Table 02586)
Values for Windows NT NTOS function number:
 000h	AcceptConnectPort	(24 bytes of parameters)
 001h	AccessCheck		(32 bytes of parameters)
 002h	AccessCheckAndAuditAlarm	(44 bytes of parameters)
 003h	AddAtom			(8 bytes of parameters)
 004h	AdjustGroupsToken	(24 bytes of parameters)
 005h	AdjustPrivilegesToken	(24 bytes of parameters)
 006h	AlertResumeThread	(8 bytes of parameters)
 007h	AlertThread		(4 bytes of parameters)
 008h	AllocateLocallyUniqueId	(4 bytes of parameters)
 009h	AllocateUuids		(12 bytes of parameters)
 00Ah	AllocateVirtualMemory	(24 bytes of parameters)
 00Bh	CallbackReturn		(12 bytes of parameters)
 00Ch	CancelIoFile		(8 bytes of parameters)
 00Dh	CancelTimer		(8 bytes of parameters)
 00Eh	ClearEvent		(4 bytes of parameters)
 00Fh	Close			(4 bytes of parameters)
 010h	CloseObjectAuditAlarm	(12 bytes of parameters)
 011h	CompleteConnectPort	(4 bytes of parameters)
 012h	ConnectPort		(32 bytes of parameters)
 013h	Continue		(8 bytes of parameters)
 014h	CreateDirectoryObject	(12 bytes of parameters)
 015h	CreateEvent		(20 bytes of parameters)
 016h	CreateEventPair		(12 bytes of parameters)
 017h	CreateFile		(44 bytes of parameters)
 018h	CreateIoCompletion	(16 bytes of parameters)
 019h	CreateKey		(28 bytes of parameters)
 01Ah	CreateMailslotFile	(32 bytes of parameters)
 01Bh	CreateMutant		(16 bytes of parameters)
 01Ch	CreateNamedPipeFile	(56 bytes of parameters)
 01Dh	CreatePagingFile	(16 bytes of parameters)
 01Eh	CreatePort		(20 bytes of parameters)
 01Fh	CreateProcess		(32 bytes of parameters)
 020h	CreateProfile		(36 bytes of parameters)
 021h	CreateSection		(28 bytes of parameters)
 022h	CreateSemaphore		(20 bytes of parameters)
 023h	CreateSymbolicLinkObject	(16 bytes of parameters)
 024h	CreateThread		(32 bytes of parameters)
 025h	CreateTimer		(16 bytes of parameters)
 026h	CreateToken		(52 bytes of parameters)
 027h	DelayExecution		(8 bytes of parameters)
 028h	DeleteAtom		(4 bytes of parameters)
 029h	DeleteFile		(4 bytes of parameters)
 02Ah	DeleteKey		(4 bytes of parameters)
 02Bh	DeleteObjectAuditAlarm	(12 bytes of parameters)
 02Ch	DeleteValueKey		(8 bytes of parameters)
 02Dh	DeviceIoControlFile	(40 bytes of parameters)
 02Eh	DisplayString		(4 bytes of parameters)
 02Fh	DuplicateObject		(28 bytes of parameters)
 030h	DuplicateToken		(24 bytes of parameters)
 031h	EnumerateKey		(24 bytes of parameters)
 032h	EnumerateValueKey	(24 bytes of parameters)
 033h	ExtendSection		(8 bytes of parameters)
 034h	FindAtom		(8 bytes of parameters)
 035h	FlushBuffersFile	(8 bytes of parameters)
 036h	FlushInstructionCache	(12 bytes of parameters)
 037h	FlushKey		(4 bytes of parameters)
 038h	FlushVirtualMemory	(16 bytes of parameters)
 039h	FlushWriteBuffer	(no parameters)
 03Ah	FreeVirtualMemory	(16 bytes of parameters)
 03Bh	FsControlFile		(40 bytes of parameters)
 03Ch	GetContextThread	(8 bytes of parameters)
 03Dh	GetPlugPlayEvent	(16 bytes of parameters)
 03Eh	GetTickCount		(no parameters)
 03Fh	ImpersonateClientOfPort	(8 bytes of parameters)
 040h	ImpersonateThread	(12 bytes of parameters)
 041h	InitializeRegistry	(4 bytes of parameters)
 042h	ListenPort		(8 bytes of parameters)
 043h	LoadDriver		(4 bytes of parameters)
 044h	LoadKey	(8 bytes of parameters)
 045h	LoadKey2		(12 bytes of parameters)
 046h	LockFile		(40 bytes of parameters)
 047h	LockVirtualMemory	(16 bytes of parameters)
 048h	MakeTemporaryObject	(4 bytes of parameters)
 049h	MapViewOfSection	(40 bytes of parameters)
 04Ah	NotifyChangeDirectoryFile	(36 bytes of parameters)
 04Bh	NotifyChangeKey		(40 bytes of parameters)
 04Ch	OpenDirectoryObject	(12 bytes of parameters)
 04Dh	OpenEvent		(12 bytes of parameters)
 04Eh	OpenEventPair		(12 bytes of parameters)
 04Fh	OpenFile		(24 bytes of parameters)
 050h	OpenIoCompletion	(12 bytes of parameters)
 051h	OpenKey			(12 bytes of parameters)
 052h	OpenMutant		(12 bytes of parameters)
 053h	OpenObjectAuditAlarm	(48 bytes of parameters)
 054h	OpenProcess		(16 bytes of parameters)
 055h	OpenProcessToken	(12 bytes of parameters)
 056h	OpenSection		(12 bytes of parameters)
 057h	OpenSemaphore		(12 bytes of parameters)
 058h	OpenSymbolicLinkObject	(12 bytes of parameters)
 059h	OpenThread		(16 bytes of parameters)
 05Ah	OpenThreadToken		(16 bytes of parameters)
 05Bh	OpenTimer		(12 bytes of parameters)
 05Ch	PlugPlayControl		(16 bytes of parameters)
 05Dh	PrivilegeCheck		(12 bytes of parameters)
 05Eh	PrivilegedServiceAuditAlarm	(20 bytes of parameters)
 05Fh	PrivilegeObjectAuditAlarm	(24 bytes of parameters)
 060h	ProtectVirtualMemory	(20 bytes of parameters)
 061h	PulseEvent		(8 bytes of parameters)
 062h	QueryInformationAtom	(20 bytes of parameters)
 063h	QueryAttributesFile	(8 bytes of parameters)
 064h	QueryDefaultLocale	(8 bytes of parameters)
 065h	QueryDirectoryFile	(44 bytes of parameters)
 066h	QueryDirectoryObject	(28 bytes of parameters)
 067h	QueryEaFile		(36 bytes of parameters)
 068h	QueryEvent		(20 bytes of parameters)
 069h	QueryFullAttributesFile	(8 bytes of parameters)
 06Ah	QueryInformationFile	(20 bytes of parameters)
 06Bh	QueryIoCompletion	(20 bytes of parameters)
 06Ch	QueryInformationPort	(20 bytes of parameters)
 06Dh	QueryInformationProcess	(20 bytes of parameters)
 06Eh	QueryInformationThread	(20 bytes of parameters)
 06Fh	QueryInformationToken	(20 bytes of parameters)
 070h	QueryIntervalProfile	(8 bytes of parameters)
 071h	QueryKey		(20 bytes of parameters)
 072h	QueryMultipleValueKey	(24 bytes of parameters)
 073h	QueryMutant		(20 bytes of parameters)
 074h	QueryObject		(20 bytes of parameters)
 075h	QueryOleDirectoryFile	(44 bytes of parameters)
 076h	QueryPerformanceCounter	(8 bytes of parameters)
 077h	QuerySection		(20 bytes of parameters)
 078h	QuerySecurityObject	(20 bytes of parameters)
 079h	QuerySemaphore		(20 bytes of parameters)
 07Ah	QuerySymbolicLinkObject	(12 bytes of parameters)
 07Bh	QuerySystemEnvironmentValue	(16 bytes of parameters)
 07Ch	QuerySystemInformation	(16 bytes of parameters)
 07Dh	QuerySystemTime		(4 bytes of parameters)
 07Eh	QueryTimer		(20 bytes of parameters)
 07Fh	QueryTimerResolution	(12 bytes of parameters)
 080h	QueryValueKey		(24 bytes of parameters)
 081h	QueryVirtualMemory	(24 bytes of parameters)
 082h	QueryVolumeInformationFile	(20 bytes of parameters)
 083h	QueueApcThread		(20 bytes of parameters)
 084h	RaiseException		(12 bytes of parameters)
 085h	RaiseHardError		(24 bytes of parameters)
 086h	ReadFile		(36 bytes of parameters)
 087h	ReadFileScatter		(36 bytes of parameters)
 088h	ReadRequestData		(24 bytes of parameters)
 089h	ReadVirtualMemory	(20 bytes of parameters)
 08Ah	RegisterThreadTerminatePort	(4 bytes of parameters)
 08Bh	ReleaseMutant		(8 bytes of parameters)
 08Ch	ReleaseSemaphore	(12 bytes of parameters)
 08Dh	RemoveIoCompletion	(20 bytes of parameters)
 08Eh	ReplaceKey		(12 bytes of parameters)
 08Fh	ReplyPort		(8 bytes of parameters)
 090h	ReplyWaitReceivePort	(16 bytes of parameters)
 091h	ReplyWaitReplyPort	(8 bytes of parameters)
 092h	RequestPort		(8 bytes of parameters)
 093h	RequestWaitReplyPort	(12 bytes of parameters)
 094h	ResetEvent		(8 bytes of parameters)
 095h	RestoreKey		(12 bytes of parameters)
 096h	ResumeThread		(8 bytes of parameters)
 097h	SaveKey	(8 bytes of parameters)
 098h	SetIoCompletion		(20 bytes of parameters)
 099h	SetContextThread	(8 bytes of parameters)
 09Ah	SetDefaultHardErrorPort	(4 bytes of parameters)
 09Bh	SetDefaultLocale	(8 bytes of parameters)
 09Ch	SetEaFile		(16 bytes of parameters)
 09Dh	SetEvent		(8 bytes of parameters)
 09Eh	SetHighEventPair	(4 bytes of parameters)
 09Fh	SetHighWaitLowEventPair	(4 bytes of parameters)
 0A0h	???			(??? bytes of parameters)
 0A1h	SetInformationFile	(20 bytes of parameters)
 0A2h	SetInformationKey	(16 bytes of parameters)
 0A3h	SetInformationObject	(16 bytes of parameters)
 0A4h	SetInformationProcess	(16 bytes of parameters)
 0A5h	SetInformationThread	(16 bytes of parameters)
 0A6h	SetInformationToken	(16 bytes of parameters)
 0A7h	SetIntervalProfile	(8 bytes of parameters)
 0A8h	SetLdtEntries		(24 bytes of parameters)
 0A9h	SetLowEventPair		(4 bytes of parameters)
 0AAh	SetLowWaitHighEventPair	(4 bytes of parameters)
 0ABh	???			(??? bytes of parameters)
 0ACh	SetSecurityObject	(12 bytes of parameters)
 0ADh	SetSystemEnvironmentValue	(8 bytes of parameters)
 0AEh	SetSystemInformation	(12 bytes of parameters)
 0AFh	SetSystemPowerState	(12 bytes of parameters)
 0B0h	SetSystemTime		(8 bytes of parameters)
 0B1h	SetTimer		(28 bytes of parameters)
 0B2h	SetTimerResolution	(12 bytes of parameters)
 0B3h	SetValueKey		(24 bytes of parameters)
 0B4h	SetVolumeInformationFile	(20 bytes of parameters)
 0B5h	ShutdownSystem		(4 bytes of parameters)
 0B6h	SignalAndWaitForSingleObject	(16 bytes of parameters)
 0B7h	StartProfile		(4 bytes of parameters)
 0B8h	StopProfile		(4 bytes of parameters)
 0B9h	SuspendThread		(8 bytes of parameters)
 0BAh	SystemDebugControl	(24 bytes of parameters)
 0BBh	TerminateProcess	(8 bytes of parameters)
 0BCh	TerminateThread		(8 bytes of parameters)
 0BDh	TestAlert		(no parameters)
 0BEh	UnloadDriver		(4 bytes of parameters)
 0BFh	UnloadKey		(4 bytes of parameters)
 0C0h	UnlockFile		(20 bytes of parameters)
 0C1h	UnlockVirtualMemory	(16 bytes of parameters)
 0C2h	UnmapViewOfSection	(8 bytes of parameters)
 0C3h	VdmControl		(8 bytes of parameters)
 0C4h	WaitForMultipleObjects	(20 bytes of parameters)
 0C5h	WaitForSingleObject	(12 bytes of parameters)
 0C6h	WaitHighEventPair	(4 bytes of parameters)
 0C7h	WaitLowEventPair	(4 bytes of parameters)
 0C8h	WriteFile		(36 bytes of parameters)
 0C9h	WriteFileGather		(36 bytes of parameters)
 0CAh	WriteRequestData	(24 bytes of parameters)
 0CBh	WriteVirtualMemory	(20 bytes of parameters)
 0CCh	W32Call			(20 bytes of parameters)
 0CDh	CreateChannel		(8 bytes of parameters)
 0CEh	ListenChannel		(8 bytes of parameters)
 0CFh	OpenChannel		(8 bytes of parameters)
 0D0h	ReplyWaitSendChannel	(12 bytes of parameters)
 0D1h	SendWaitReplyChannel	(16 bytes of parameters)
 0D2h	SetContextChannel	(4 bytes of parameters)
 0D3h	YieldExecution		(no parameters)

INT 2E - 4DOS v2.x-3.03 SHELL2E.COM - UNINSTALL
	BX = E22Eh
	DS:SI -> zero byte
Return: if successful, SHELL2E terminates itself with INT 21/AH=4Ch

INT 2F - Multiplex - NOTES
	AH = identifier of program which is to handle the interrupt
	   00h-3Fh reserved for IBM (for DOS)
	   40h-7Fh reserved for Microsoft (for DOS)
	   80h-B7h reserved for IBM
	   B8h-BFh reserved for networks
	   C0h-FFh reserved for applications
	AL is the function code
   This is a general mechanism for verifying the presence of a TSR and
   communicating with it.  When searching for a free identifier code for AH
   using the installation check (AL=00h), the calling program should set
   BX/CX/DX to 0000h and must not depend on any registers other than CS:IP
   and SS:SP to be valid on return, since numerous programs now use additional
   registers on input and/or output for the installation check.
Notes:	Since the multiplex chain is growing so long, and beginning to
	  experience multiplex number collisions, I have proposed an alternate
	  multiplex interrupt on INT 2D.  If you decide to use the alternate
	  multiplex, please let me know.
	DOS and some other programs return values in the flags register, so
	  any TSR which chains by calling the previous handler rather than
	  jumping to it should ensure that the returned flags are preserved
	  and passed back to the original caller
SeeAlso: INT 2D"ALTERNATE MULTIPLEX"

INT 2F - BMB Compuscience Canada Utilities Interface - INSTALLATION CHECK
	AH = xx (dynamically assigned based upon a search for a multiplex
		 number which doesn't answer installed)
	AL = 00h installation check
	ES:DI = EBEBh:BEBEh
Return: AL = 00h not installed
	     01h not installed, not OK to install
	     FFh installed; if ES:DI was EBEBh:BEBEh on entry, ES:DI will point
		 to a string of the form 'MMMMPPPPPPPPvNNNN' where MMMM is a
		 short form of the manufacturer's name, PPPPPPPP is a product
		 name and NNNN is the product's version number

INT 2F - Ross Wentworth's Turbo Pascal POPUP LIBRARY
	AH = programmer-selected multiplex number
	AL = function
	    00h installation check
		Return: AL = FFh if installed
	    01h get TSR interrupt vectors
		Return: DX:AX -> vector table (see #02587)
	    02h get TSR code segment
		Return: AX = code segment for all interrupt handlers
	    03h call user exit routine and release TSR's memory
	    04h get signature string
		Return: DX:AX -> counted string containing signature
	    05h get TSR's INT 2F handler
		Return: DX:AX -> INT 2F handler
	    06h enable/disable TSR
		BL = new state (00h disabled, 01h enabled)
	    07h activate TSR (popup if not disabled)
	    08h get hotkeys
		BL = which hotkey (00h = hotkey 1, 01h = hotkey 2)
		Return: AX = hotkey (AH = keyflags, AL = scancode)
	    09h set hotkey
		BL = which hotkey (00h = hotkey 1, 01h = hotkey 2)
		CX = new hotkey (CH = keyflags, CL = scancode)
	    0Ah-1Fh reserved
Index:	installation check;Ross Wentworth POPUP library
Index:	hotkeys;Ross Wentworth POPUP library

Format of POPUP vector table entry:
Offset	Size	Description	(Table 02587)
 00h	BYTE	vector number (00h = end of table)
 01h	DWORD	original vector
 05h	WORD	offset of interrupt handler in TSR's code segment

INT 2F - CiriSOFT Spanish University of Valladolid TSR's Interface
	AH = xx (dynamically assigned based upon a search for a multiplex
		 number from C0h to FFh which doesn't answer installed)
	AL = 00h installation check
	ES:DI = 1492h:1992h
Return: AL = 00h not installed
	     01h not installed, not OK to install
	     FFh installed; and if ES:DI was 1492h:1992h on entry, ES:DI will
		   point to author_name_ver table (see #02588)
	AH = FFh
Note:	this interface permits advanced communication with TSRs: it is possible
	  to make a generic uninstall utility, advanced TSR relocator programs
	  in order to fit fragmented memory areas, etc.
See also: INT 2D"AMIS",INT 2F"Compuscience"
Index:	installation check;CiriSOFT TSR interface
Index:	uninstall;CiriSOFT TSR interface

Format of CiriSOFT author_name_ver table:
Offset	Size	Description	(Table 02588)
 -16	WORD	segment of the start of the resident TSR code (CS in programs
		  with PSP, XMS upper memory segment if installed as UMB...)
 -14	WORD	offset of the start of the resident TSR code (frequently 100h
		  in *.COM programs and 0 in upper memory TSR's).
 -12	WORD	memory used by TSR (in paragraphs). Knowing the memory area
		  used by TSR is possible to determine if hooked vectors are
		  still pointing it (and if it is safe to uninstall).
 -10	BYTE	characteristics byte (see #02589)
 -9	BYTE	number of multiplex entry used (redefinition available). Note
		  that the TSR must use THIS variable in it's INT 2Fh handler.
 -8	WORD	offset to vector_area table (see #02590)
 -6	WORD	offset to extra_area table (see #02591,#02589 [bit 7])
 -4   4 BYTEs	signature string "*##*"
 00h	var	"AUTHOR:PROGRAM_NAME:VERSION",0	 (variable length, this area
		  is used in order to determine if the TSR is already resident
		  and it's version code; the ':' char is used as delimiter)

Bitfields for CiriSOFT characteristics byte:
Bit(s)	Description	(Table 02589)
 0-2	type
	000 normal program (with PSP)
	001 upper XMS memory block (needed HIMEM.SYS function to free memory
	      when uninstalling)
	010 device driver (*.SYS)
	011 device driver in EXE format
	1xx others (reserved)
 3-6	reserved
 7	set if extra_table defined and supported (see #02591)
SeeAlso: #02588

Format of CiriSOFT vector_area table:
Offset	Size	Description	(Table 02590)
 -1	BYTE	number of vectors intercepted by TSR
 00h	BYTE	first vector number
 01h	DWORD	first vector pointer before installing the TSR
 05h	BYTE	second vector number
 06h	DWORD	second vector pointer before installing the TSR
 0Ah	...	(and so on)
Note:	the TSR must use these variables to invoke the previous interrupt
	  handler routines
SeeAlso: #02588

Format of extra_area table (needed only to improve relocation feature):
Offset	Size	Description	(Table 02591)
 00h	WORD	offset to external_ctrl table (see #02592)
		0000h if not supported
 02h	WORD	reserved for future use (0)
SeeAlso: #02588

Format of CiriSOFT external_ctrl table:
Offset	Size	Description	(Table 02592)
 00h	BYTE	bit 0: TSR is relocatable (no absolute segment references)
 01h	WORD	offset to a variable which can activate/inhibit the TSR
 ---And if bit 0 in offset 00h is off:
 03h	DWORD	pointer to ASCIZ pathname for executable file which supports
		  /SR parameter (silent installation & inhibit)
 07h	DWORD	pointer to first variable to initialize on the copy reloaded
		  from the previous TSR still resident
 0Bh	DWORD	pointer to last variable (all variables packed in one block)

INT 2F U - DOS 2.x only PRINT.COM - SUBMIT FILE FOR PRINTING
	AH = 00h
	DS:DX -> opened FCB (see #01345 at INT 21/AX=0Fh)
Return: AH = number of files currently in print queue
	AL = status
	    00h file successfully added
	    01h queue is full
	ES:BX -> print queue (10 FCBs; first byte of FFh indicates unused)
	ES:DX -> currently-printing FCB (if DX=FFFFh, none printing)
Notes:	DOS 2.x PRINT.COM does not chain to previous INT 2F handler
	values in AH other than 00h or 01h cause PRINT to return the number of
	  files in the queue in AH
SeeAlso: AH=01h"PRINT",AX=0102h

INT 2F U - PSPRINT - PRINT JOB CONTROL
	AH = 00h
	???
Return: ???

INT 2F - DOS 3.1+ PRINT - GIVE PRINT A TIME SLICE
	AX = 0080h
Return: after PRINT executes
Notes:	PRINT returns AL=01h if AH=00h but AL is not 80h on entry
	this function is not supported by the Novell DOS 7 PRINT.COM

INT 2F - Personal NetWare - VLM - ???
	AX = 00D8h
	???
Return: ???
Note:	hooked by one of the .VLMs loaded by VLM.EXE v1.10, but apparently a
	  NOP

INT 2F U - DOS 2.x only PRINT.COM - REMOVE FILE FROM PRINT QUEUE
	AH = 01h
	DS:DX -> FCB (see #01345 at INT 21/AH=0Fh) for file to be canceled
Return: AH = number of files currently in print queue
	AL = 00h (successful)
	ES:BX -> print queue (10 FCBs; first byte of FFh indicates unused)
	ES:DX -> currently-printing FCB (if DX=FFFFh, none printing)
Notes:	DOS 2.x PRINT.COM does not chain to previous INT 2F handler
	values in AH other than 00h or 01h cause PRINT to return the number of
	  files in the queue in AH
SeeAlso: AH=00h"PRINT.COM",AX=0103h

INT 2F - DOS 3.0+ PRINT - INSTALLATION CHECK
	AX = 0100h
Return: AL = status
	    00h not installed
	    01h not installed, but not OK to install
	    FFh installed
		AH = 00h (Novell DOS 7)
SeeAlso: AX=0101h

INT 2F U - PrintCache 3.1 PRINT.COM - INSTALLATION CHECK
	AX = 0100h
	SI = 20D6h
	DI = 8761h
Return: AX = 00FFh if installed
	DI = 0001h if PrintCache's PRINT.COM installed and magic values match
	    SI = resident code segment
Program: PrintCache PRINT.COM is a DOS PRINT replacement included in
	  LaserTools' PrintCache memory/disk-based print spooler package
Note:	if either of SI or DI differ from the indicated magic values, only AX
	  will be modified on return, for compatibility with DOS PRINT
SeeAlso: AX=0101h/SI=20D6h,AX=C000h"PCACHE"

INT 2F - DOS 3.0+ PRINT - SUBMIT FILE FOR PRINTING
	AX = 0101h
	DS:DX -> submit packet (see #02593)
Return: CF clear if successful
	    AL = status
		01h added to queue
		9Eh now printing
	CF set on error
	    AX = error code (see #02594,#01680 at INT 21/AH=59h/BX=0000h)
SeeAlso: AX=0102h

Format of PRINT submit packet:
Offset	Size	Description	(Table 02593)
 00h	BYTE	level (must be 00h)
 01h	DWORD	pointer to ASCIZ filename (no wildcards)

(Table 02594)
Values for PRINT error code:
 0001h	invalid function
 0002h	file not found
 0003h	path not found
 0004h	out of file handles
 0005h	access denied
 0008h	print queue full
 0009h	spooler busy
 000Ch	name too long
 000Fh	invalid drive

INT 2F U - PrintCache v3.1 PRINT.COM - SUBMIT FILE FOR PRINTING
	AX = 0101h
	SI = 20D6h
	DI = 8761h
	DS:DX -> submit packet (see #02593)
	CL = print options
	    bit 4: use default options
Return: CF clear if successful
	    AL = status
		01h added to queue
		9Eh now printing
	CF set on error
	    AX = error code (see #02594)
Program: PrintCache PRINT.COM is a DOS PRINT replacement included in
	  LaserTools' PrintCache memory/disk-based print spooler package
Note:	if either SI or DI differs from the indicated magic values on entry,
	  PrintCache will use the default print options for the file for
	  compatibility with DOS PRINT
SeeAlso: AX=0100h/SI=20D6h,AX=0101h,AH=00h"PRINT",AX=0107h"PrintCache"

INT 2F - DOS 3.0+ PRINT - REMOVE FILE FROM PRINT QUEUE
	AX = 0102h
	DS:DX -> ASCIZ filename (wildcards allowed)
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02594)
SeeAlso: AX=0101h,AX=0103h,AH=01h"PRINT"

INT 2F - DOS 3.0+ PRINT - CANCEL ALL FILES IN PRINT QUEUE
	AX = 0103h
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02594)
SeeAlso: AX=0102h

INT 2F - DOS 3.0+ PRINT - FREEZE PRINT QUEUE TO READ JOB STATUS
	AX = 0104h
Return: CF clear if successful
	    DX = error count since status last read
	    DS:SI -> print queue
	CF set on error
	    AX = error code (see #02594)
Desc:	get the list of print jobs, temporarily suspending PRINT's activities
	  to avoid changing the list while it is being examined
Notes:	the print queue is an array of 64-byte ASCIZ filenames terminated by
	  an empty filename; the first name is the file currently being printed
	printing is stopped until AX=0105h is called to prevent the queue
	  from changing while the filenames are being read
SeeAlso: AX=0101h,AX=0105h

INT 2F - DOS 3.0+ PRINT - RESTART PRINT QUEUE AFTER STATUS READ
	AX = 0105h
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02594)
Desc:	restart PRINT's activities once an application finishes examining the
	  print queue
SeeAlso: AX=0104h

INT 2F - DOS 3.3+ PRINT - GET PRINTER DEVICE
	AX = 0106h
Return: CF set if files in print queue
	    AX = error code 0008h (queue full)
	    DS:SI -> device driver header (see #01646)
	CF clear if print queue empty
	    AX = 0000h
Desc:	determine which device, if any, PRINT is currently using for output
Notes:	undocumented prior to the release of MS-DOS 5.0
	this function can be used to allow a program to avoid printing to the
	  printer on which PRINT is currently performing output
SeeAlso: AX=0104h

INT 2F U - PrintCache v3.1 PRINT.COM - SET TRAILING FORM FEEDS
	AX = 0107h
	CL bit 0: output form feed between print jobs
Return: AL destroyed
SeeAlso: AX=0100h/SI=20D6h,AX=0101h/SI=20D6h

INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - INSTALLATION CHECK
	AX = 0200h
Return: AL = FFh if installed
Desc:	determine whether the PC LAN Program redirector is installed
SeeAlso: AX=0201h,AX=0203h

INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
	AX = 0201h
Return: nothing???
Notes:	this function is called by the DOS 3.3+ PRINT.COM
	AX=0202h appears to be the opposite function
	these functions are supposedly used to signal opening and closing of
	  printers
SeeAlso: AX=0202h

INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
	AX = 0202h
	???
Return: nothing???
Notes:	this function is called by the DOS 3.3+ PRINT.COM
	these functions are supposedly used to signal opening and closing of
	  printers
SeeAlso: AX=0201h

INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
	AX = 0203h
Return: nothing???
Notes:	this function is called by the DOS 3.3+ PRINT.COM
	AX=0204h appears to be the opposite function
	these functions are supposedly used to signal opening and closing of
	  printers
SeeAlso: AX=0200h,AX=0204h

INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
	AX = 0204h
	???
Return: nothing???
Notes:	this function is called by the DOS 3.3+ PRINT.COM
	AX=0203h appears to be the opposite function
	these functions are supposedly used to signal opening and closing of
	  printers
SeeAlso: AX=0200h,AX=0203h

INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
	AX = 02xxh
	???
Return: ???

INT 2F U - DOS 3.0+ CRITICAL ERROR HANDLER - INSTALLATION CHECK
	AX = 0500h
Return: AL = status
	    00h not installed, OK to install
	    01h not installed, can't install
	    FFh installed
	BX destroyed (MSCDEX v2.21-2.25)
	CF clear (MSCDEX v2.21-2.25)
Desc:	determine whether a critical error message override is installed
Note:	this set of functions allows a user program to partially or completely
	  override the default critical error handler's message in COMMAND.COM
SeeAlso: AH=05h,INT 24

INT 2F CU - DOS 3.0+ CRITICAL ERROR HANDLER - EXPAND ERROR INTO STRING
	AH = 05h
---DOS 3.x---
	AL = extended error code (not zero)
---DOS 4.0+ ---
	AL = error type
	    01h DOS extended error code
	    02h parameter error
	BX = error code
Return: CF clear if successful
	    ES:DI -> ASCIZ error message (read-only)
	    AL = completion state
		00h message requires completion with device name, drive, etc.
		01h message is complete as returned
	CF set if error code can't be converted to string
	    AX,DI,ES destroyed
	other flags corrupted
Notes:	called at start of COMMAND.COM's default critical error handler if
	  installed by a user program, allowing partial or complete overriding
	  of the default error messages
	subfunction 02h is called by many DOS 4 external programs
	DR DOS's COMMAND.COM appends additional info ("0 files copied") to the
	  returned string
SeeAlso: AX=0500h,AX=122Eh,INT 24

INT 2F - DOS 3.0+ ASSIGN - INSTALLATION CHECK
	AX = 0600h
Return: AL = status
	    00h not installed
	    01h not installed, but not OK to install
	    FFh installed
Notes:	ASSIGN is not a TSR in DR DOS 5.0; it is internally replaced by SUBST
	  (see INT 21/AH=52h)
	undocumented prior to the release of DOS 5.0
SeeAlso: AX=0601h,INT 21/AH=52h

INT 2F U - DOS 3.0+ ASSIGN - GET DRIVE ASSIGNMENT TABLE
	AX = 0601h
Return: ES = segment of ASSIGN work area and assignment table
Note:	the 26 bytes starting at ES:0103h specify which drive each of A: to Z:
	  is mapped to.	 Initially set to 01h 02h 03h....
SeeAlso: AX=0600h,AX=AF14h"WinDOS"

INT 2F U - DRIVER.SYS support - INSTALLATION CHECK
	AX = 0800h
Return: AL = status
	    00h not installed, OK to install
	    01h not installed, not OK to install
	    FFh installed
Desc:	determine whether the internal support code used by DRIVER.SYS is
	  present; it is always present in DOS 3.2+
Note:	supported by DR DOS 5.0 and Novell DOS 7

INT 2F U - DRIVER.SYS support - ADD NEW BLOCK DEVICE
	AX = 0801h
	DS:DI -> drive data table (see #02601,#02602,#02603)
Return: AX,BX,SI,ES destroyed
Notes:	moves down internal list of drive data tables, copying and modifying
	  the drive description flags word for tables referencing same physical
	  drive
	the data table is appended to the chain of tables
	supported by DR DOS 5.0 and Novell DOS 7
SeeAlso: AX=0803h

INT 2F U - DRIVER.SYS support - EXECUTE DEVICE DRIVER REQUEST
	AX = 0802h
	ES:BX -> device driver request header (see #02597)
Return: request header updated as per requested operation
	STACK:	WORD	original flags from INT call (left by RETF in device
			  driver, at least in DOS 5.0-6.22)
Notes:	supported by DR DOS 5.0
	DOS 3.2 executes this function on any AL value from 02h through F7h;
	  DOS 4.0+ executes this function on AL=02h and AL=04h-F7h
	the command codes (see #02595) and structures described below apply
	  to all drivers which support the appropriate commands; this call is
	  just one of a number of ways in which a device driver request may
	  be invoked
	supported by Novell DOS 7
SeeAlso: AX=0800h,AX=0801h,AX=0803h,AX=1510h,INT 21/AH=52h,INT 21/AH=99h
SeeAlso: INT 21/AH=9Ah

(Table 02595)
Values for device driver command code:
 00h (0)  INIT
 01h (1)  MEDIA CHECK (block devices)
 02h (2)  BUILD BPB (block devices)
 03h (3)  IOCTL INPUT
 04h (4)  INPUT
 05h (5)  NONDESTRUCTIVE INPUT, NO WAIT (character devices)
 06h (6)  INPUT STATUS (character devices)
 07h (7)  INPUT FLUSH (character devices)
 08h (8)  OUTPUT
 09h (9)  OUTPUT WITH VERIFY
 0Ah (10) OUTPUT STATUS (character devices)
 0Bh (11) OUTPUT FLUSH (character devices)
 0Ch (12) IOCTL OUTPUT
 0Dh (13) (DOS 3.0+) DEVICE OPEN
 0Eh (14) (DOS 3.0+) DEVICE CLOSE
 0Fh (15) (DOS 3.0+) REMOVABLE MEDIA (block devices)
 10h (16) (DOS 3.0+) OUTPUT UNTIL BUSY (character devices)
 11h (17) (European MS-DOS 4.0) STOP OUTPUT (console screen drivers only)
 12h (18) (European MS-DOS 4.0) RESTART OUTPUT (console screen drivers only)
 13h (19) (DOS 3.2+) GENERIC IOCTL
 14h (20) (DOS 4.0, KKCFUNC) DEVICE RESTORE (character device)
 15h (21) (European MS-DOS 4.0) RESET UNCERTAIN MEDIA FLAG
 16h (22) (DOS 4.0) unknown???
 17h (23) (DOS 3.2+) GET LOGICAL DEVICE
 18h (24) (DOS 3.2+) SET LOGICAL DEVICE
 19h (25) (DOS 5.0+) CHECK GENERIC IOCTL SUPPORT
 80h (128)(CD-ROM,DRFAT32) READ LONG
 81h (129)(CD-ROM) reserved
 82h (130)(CD-ROM,DRFAT32) READ LONG PREFETCH
 83h (131)(CD-ROM,DRFAT32) SEEK
 84h (132)(CD-ROM) PLAY AUDIO
 85h (133)(CD-ROM) STOP AUDIO
 86h (134)(CD-ROM,DRFAT32) WRITE LONG
 87h (135)(CD-ROM,DRFAT32) WRITE LONG VERIFY
 88h (136)(CD-ROM) RESUME AUDIO

Bitfields for device request status:
Bit(s)	Description	(Table 02596)
 15	error
 14-11	reserved
 10	??? set by DOS kernel on entry to some driver calls
 9	busy
 8	done (may be clear on return under European MS-DOS 4.0)
 7-0	error code if bit 15 set (see #02598)

Format of device driver request header:
Offset	Size	Description	(Table 02597)
 00h	BYTE	length of request header
 01h	BYTE	subunit within device driver
 02h	BYTE	command code (see #02595)
 03h	WORD	status (filled in by device driver) (see #02596)
---DOS---
 05h  4 BYTEs	reserved (unused in DOS 2.x and 3.x)
 09h	DWORD	(European MS-DOS 4.0 only) pointer to next request header in
			  device's request queue
		(other versions) reserved (unused in DOS 2.x and 3.x)
---STARLITE architecture---
 05h	DWORD	pointer to next request header
 09h  4 BYTEs	reserved
---command code 00h---
 0Dh	BYTE	(ret) number of units
 0Eh	DWORD	(call) pointer to DOS device helper function (see #02599)
			  (European MS-DOS 4.0 only)
		(call) pointer past end of memory available to driver (DOS 5+)
		(ret) address of first free byte following driver
 12h	DWORD	(call) pointer to commandline arguments
		(ret) pointer to BPB array (block drivers) or
			  0000h:0000h (character drivers)
 16h	BYTE	(DOS 3.0+) drive number for first unit of block driver (0=A)
   ---European MS-DOS 4.0---
 17h	DWORD	pointer to function to save registers on stack
   ---DOS 5+ ---
 17h	WORD	(ret) error-message flag
		0001h MS-DOS should display error msg on init failure
---command code 01h---
 0Dh	BYTE	media descriptor
 0Eh	BYTE	(ret) media status
		00h don't know
		01h media has not changed
		FFh media has been changed
 0Fh	DWORD	(ret, DOS 3.0+) pointer to previous volume ID if the
		  OPEN/CLOSE/RM bit in device header is set and disk changed
		Note:	some drives (or controllers???) forget the change line
			  status if another drive is accessed afterwards. The
			  DOS IO.SYS layer takes care of this by not relying
			  on the reported change line status when the change 
			  line is not active and a different drive is accessed,
			  instead it reports "don't know" to the DOS kernel.
---command code 02h---
 0Dh	BYTE	media descriptor
 0Eh	DWORD	transfer address
		-> scratch sector if NON-IBM FORMAT bit in device header set
		-> first FAT sector otherwise
 12h	DWORD	pointer to BPB (set by driver) (see #01663 at INT 21/AH=53h)
---command codes 03h,0Ch---
		  (see also INT 21/AX=4402h"DOS 2+",INT 21/AX=4403h"DOS")
 0Dh	BYTE	media descriptor (block devices only)
 0Eh	DWORD	transfer address
 12h	WORD	(call) number of bytes to read/write
		(ret) actual number of bytes read or written
---command codes 04h,08h,09h (except Compaq DOS 3.31, DR DOS 6)---
 0Dh	BYTE	media descriptor (block devices only)
 0Eh	DWORD	transfer address
 12h	WORD	byte count (character devices) or sector count (block devices)
 14h	WORD	starting sector number (block devices only)
 16h	DWORD	(DOS 3.0+) pointer to volume ID if error 0Fh returned
 1Ah	DWORD	(DOS 4.0+) 32-bit starting sector number (block devices with
		  device attribute word bit 1 set only) if starting sector
		  number above is FFFFh (see INT 21/AH=52h)
---command codes 04h,08h,09h (Compaq DOS 3.31, DR DOS 6)---
 0Dh	BYTE	media descriptor (block devices only)
 0Eh	DWORD	transfer address
 12h	WORD	byte count (character devices) or sector count (block devices)
 14h	DWORD	32-bit starting sector number (block devices only)
	Note:	to reliably determine which variant of the request block for
		  functions 04h,08h,09h has been passed to the driver, check
		  the length field as well as the word at offset 14h.  If the
		  length is 1Eh and 14h=FFFFh, use the DWORD at 1Ah as the
		  starting sector number; if the length is 18h, use the DWORD
		  at 14h; otherwise, use the WORD at 14h.
---command code 05h---
 0Dh	BYTE	byte read from device if BUSY bit clear on return
---command codes 06h,07h,0Ah,0Bh,0Dh,0Eh,0Fh---
 no further fields
---command code 10h---
 0Dh	BYTE	unused
 0Eh	DWORD	transfer address
 12h	WORD	(call) number of bytes to write
		(ret) actual number of bytes written
---command codes 11h,12h---
 0Dh	BYTE	reserved
---command code 14h---
 no further fields
	Note:	This is at least true for KKCFUNC.SYS' "device restore".
		  KKCFUNC.SYS checks that INT 2Fh in the IVT still points
		  to KKCFUNC's own INT 2Fh entry point.	 In this case it
		  restores the original INT 2Fh vector, as recorded at device
		  init, into the IVT.
	SeeAlso: INT 2F/AH=4Dh
---command code 15h---
 no further fields
---command codes 13h,19h---
 0Dh	BYTE	category code
		00h-7Fh reserved for Microsoft
		00h unknown
		01h COMn: (serial) (DOS 3.3+)
		02h reserved for terminal control
		03h CON (DOS 3.3+)
		04h reserved for keyboard control
		05h LPTn:
		07h mouse (European MS-DOS 4.0)
		08h disk
		48h FAT32 disk control (MS-DOS 7.10+)
		80h-FFh reserved for OEM/user-defined
		9Eh (STARLITE) Media Access Control driver
		EDh (DR PalmDOS) login security
		SeeAlso: #01558
 0Eh	BYTE	function code
		00h (STARLITE) MAC Bind request
 0Fh	WORD	copy of DS at time of IOCTL call (apparently unused in DOS 3.3)
		SI contents (European MS-DOS 4.0)
 11h	WORD	offset of device driver header (see #01646)
		DI contents (European MS-DOS 4.0)
 13h	DWORD	pointer to parameter block from INT 21/AX=440Ch or AX=440Dh
---command codes 80h,82h---
 0Dh	BYTE	addressing mode
		00h HSG (default)
		01h Phillips/Sony Red Book
 0Eh	DWORD	transfer address (ignored for command 82h)
 12h	WORD	number of sectors to read
		(if 0 for command 82h, request is an advisory seek)
 14h	DWORD	starting sector number
		logical sector number in HSG mode
		frame/second/minute/unused in Red Book mode
		(HSG sector = minute * 4500 + second * 75 + frame - 150)
 18h	BYTE	data read mode
		00h cooked (2048 bytes per frame)
		01h raw (2352 bytes per frame, including EDC/ECC)
 19h	BYTE	interleave size (number of sectors stored consecutively)
 1Ah	BYTE	interleave skip factor
		(number of sectors between consecutive portions)
---command code 83h---
 0Dh	BYTE	addressing mode
		00h HSG (default)
		01h Phillips/Sony Red Book
 0Eh	DWORD	transfer address (ignored)
 12h	WORD	number of sectors to read (ignored)
 14h	DWORD	starting sector number (see also above)
---command code 84h---
 0Dh	BYTE	addressing mode
		00h HSG (default)
		01h Phillips/Sony Red Book
 0Eh	DWORD	starting sector number (see also above)
 12h	DWORD	number of sectors to play
---command codes 85h,88h---
 no further fields
---command codes 86h,87h---
 0Dh	BYTE	addressing mode
		00h HSG (default)
		01h Phillips/Sony Red Book
 0Eh	DWORD	transfer address (ignored in write mode 0)
 12h	WORD	number of sectors to write
 14h	DWORD	starting sector number (also see above)
 18h	BYTE	write mode
		00h mode 0 (write all zeros)
		01h mode 1 (default) (2048 bytes per sector)
		02h mode 2 form 1 (2048 bytes per sector)
		03h mode 2 form 2 (2336 bytes per sector)
 19h	BYTE	interleave size (number of sectors stored consecutively)
 1Ah	BYTE	interleave skip factor
		(number of sectors between consecutive portions)

(Table 02598)
Values for device driver error code:
 00h	write-protect violation
 01h	unknown unit
 02h	drive not ready
 03h	unknown command
 04h	CRC error
 05h	bad drive request structure length
 06h	seek error
 07h	unknown media
 08h	sector not found
 09h	printer out of paper
 0Ah	write fault
 0Bh	read fault
 0Ch	general failure
 0Dh	reserved
 0Eh	(CD-ROM) media unavailable
 0Fh	invalid disk change

(Table 02599)
Call European MS-DOS 4.0 device helper function with:
	DL = function
	    00h "SchedClock" called on each timer tick
		AL = tick interval in milliseconds
	    01h "DevDone" device I/O complete
		ES:BX -> request header
		Note:	must update status word first; may be called from
			  an interrupt handler
	    02h "PullRequest" pull next request from queue
		DS:SI -> DWORD pointer to start of device's request queue
		Return: ZF clear if pending request
			    ES:BX -> request header
			ZF set if no more requests
	    03h "PullParticular" remove specific request from queue
		DS:SI -> DWORD pointer to start of device's request queue
		ES:BX -> request header
		Return: ZF set if request header not found
	    04h "PushRequest" push the request onto the queue
		DS:SI -> DWORD pointer to start of device's request queue
		ES:BX -> request header
		interrupts disabled
	    05h "ConsInputFilter" keyboard input check
		AX = character (high byte 00h if PC ASCII character)
		Return: ZF set if character should be discarded
			ZF clear if character should be handled normally
		Note:	called by keyboard interrupt handler so DOS can scan
			  for special input characters
	    06h "SortRequest" push request in sorted order by starting sector
		DS:SI -> DWORD pointer to start of device's request queue
		ES:BX -> request header
		interrupts disabled
	    07h "SigEvent" send signal on keyboard event
		AH = event identifier
		Return: AL,FLAGS destroyed
	    09h "ProcBlock" block on event
		AX:BX = event identifier (typically a pointer)
		CX = timeout in ms or 0000h for never
		DH = interruptable flag (nonzero if pause may be interrupted)
		interrupts disabled
		Return: after corresponding ProcRun call
			CF clear if event wakeup, set if unusual wakeup
			ZF set if timeout wakeup, clear if interrupted
			AL = wakeup code, nonzero if unusual wakeup
			interrupts enabled
			BX,CX,DX destroyed
		Note:	block process and schedules another to run
	    0Ah "ProcRun" unblock process
		AX:BX = event identifier (typically a pointer)
		Return: AX = number of processes awakened
			ZF set if no processes awakened
			BX,CX,DX destroyed
	    0Bh "QueueInit" initialize/clear character queue
		DS:BX -> character queue structure (see #02600)
		Note:	the queue size field must be set before calling
	    0Dh "QueueWrite" put a character in the queue
		DS:BX -> character queue (see #02600)
		AL = character to append to end of queue
		Return: ZF set if queue is full
			ZF clear if character stored
	    0Eh "QueueRead" get a character from the queue
		DS:BX -> character queue (see #02600)
		Return: ZF set if queue is empty
			ZF clear if characters in queue
			    AL = first character in queue
	    10h "GetDOSVar" return pointer to DOS variable
		AL = index of variable
		    03h current process ID
		BX = index into variable if AL specifies an array
		CX = expected length of variable
		Return: CF clear if successful
			    DX:AX -> variable
			CF set on error
			    AX,DX destroyed
			BX,CX destroyed
		Note:	the variables may not be modified
	    14h "Yield" yield CPU if higher-priority task ready to run
		Return: FLAGS destroyed
	    1Bh "CritEnter" begin system critical section
		DS:BX -> semaphore (6 BYTEs, initialized to zero)
		Return: AX,BX,CX,DX destroyed
	    1Ch "CritLeave" end system critical section
		DS:BX -> semaphore (6 BYTEs, initialized to zero)
		Return: AX,BX,CX,DX destroyed
		Note:	must be called in the context of the process which
			  called CritEnter on the semaphore
Note:	the DWORD pointing at the request queue must be allocated by the driver
	  and initialized to 0000h:0000h.  It always points at the next request
	  to be executed

Format of European MS-DOS 4.0 character queue:
Offset	Size	Description	(Table 02600)
 00h	WORD	size of queue in bytes
 02h	WORD	index of next character out
 04h	WORD	count of characters in the queue
 06h  N BYTEs	queue buffer

INT 2F U - DOS 4.0+ DRIVER.SYS support - GET DRIVE DATA TABLE LIST
	AX = 0803h
Return: DS:DI -> first drive data table in list (see #02601,#02602,#02603)
Note:	not available under DR DOS 5.0, but supported by Novell DOS 7 (using
	  the MS-DOS 4+ data table format)
SeeAlso: AX=0801h

Format of DOS 3.30 drive data table:
Offset	Size	Description	(Table 02601)
 00h	DWORD	pointer to next table (offset FFFFh if last table)
 04h	BYTE	physical unit number (for INT 13)
 05h	BYTE	logical drive number (0=A:)
 06h 19 BYTEs	BIOS Parameter Block (see also INT 21/AH=53h)
		Offset	Size	Description
		 00h	WORD	bytes per sector
		 02h	BYTE	sectors per cluster, FFh if unknown
		 03h	WORD	number of reserved sectors
		 05h	BYTE	number of FATs
		 06h	WORD	number of root dir entries
		 08h	WORD	total sectors
		 0Ah	BYTE	media descriptor, 00h if unknown
		 0Bh	WORD	sectors per FAT
		 0Dh	WORD	sectors per track
		 0Fh	WORD	number of heads
		 11h	WORD	number of hidden sectors
 19h	BYTE	flags
		bit 6: 16-bit FAT instead of 12-bit FAT
 1Ah	WORD	number of DEVICE OPEN calls without corresponding DEVICE CLOSE
 1Ch 11 BYTEs	volume label or "NO NAME    " if none (always "NO NAME" for
		  fixed media)
 27h	BYTE	terminating null for volume label???
 28h	BYTE	device type (see #01561 at INT 21/AX=440Dh"DOS 3.2+")
 29h	WORD	bit flags describing drive (see #02604)
 2Bh	WORD	number of cylinders
 2Dh 19 BYTEs	BIOS Parameter Block for highest capacity supported
 40h  3 BYTEs	???
 43h  9 BYTEs	filesystem type???, default = "NO NAME	"
		(apparently only MS-DOS 3.30 fixed media, nulls for removable
		  media and PC-DOS 3.30)
 4Ch	BYTE	least-significant byte of last-accessed cylinder number
---removable media---
 4Dh	DWORD	time of last access in clock ticks (FFFFFFFFh if never)
---fixed media---
 4Dh	WORD	partition (FFFFh = primary, 0001h = extended)
 4Fh	WORD	absolute cylinder number of partition's start on physical
		  drive (always FFFFh if primary partition)
SeeAlso: #02602,#02603

Format of COMPAQ DOS 3.31 drive data table:
Offset	Size	Description	(Table 02602)
 00h	DWORD	pointer to next table (offset FFFFh if last table)
 04h	BYTE	physical unit number (for INT 13)
 05h	BYTE	logical drive number (0=A:)
 06h 25 BYTEs	BIOS Parameter Block (see #02603)
 1Fh  6 BYTEs	reserved fields from BPB above???
 25h	BYTE	flags
		bit 6: 16-bit FAT instead of 12-bit FAT
		bit 5: large volume???
 26h	WORD	device-open count???
 28h 11 BYTEs	volume label or "NO NAME    " if none (always "NO NAME" for
		  fixed media)
 33h	BYTE	terminating null for volume label
 34h	BYTE	device type (see #01561 at INT 21/AX=440Dh"DOS 3.2+")
 35h	WORD	bit flags describing drive (see #02604)
 37h	WORD	number of cylinders
 39h 25 BYTEs	BIOS parameter block for highest capacity drive supports
 52h  6 BYTEs	??? apparently always zeros
 58h	BYTE	least-significant byte of last-accessed cylinder number
---removable media---
 59h	DWORD	time of last access in clock ticks (FFFFFFFFh if never)
---fixed media---
 59h	WORD	partition (FFFFh = primary, 0001h = extended)
 5Bh	WORD	absolute cylinder number of partition's start on physical
		  drive (always FFFFh if primary partition)
SeeAlso: #02601,#02603

Format of DOS 4.0-7.0 drive data table:
Offset	Size	Description	(Table 02603)
 00h	DWORD	pointer to next table (offset FFFFh if last table)
 04h	BYTE	physical unit number (for INT 13)
 05h	BYTE	logical drive number (0=A:)
 06h 25 BYTEs	BIOS Parameter Block (see also INT 21/AH=53h)
		Offset	Size	Description
		 00h	WORD	bytes per sector
		 02h	BYTE	sectors per cluster, FFh if unknown
		 03h	WORD	number of reserved sectors
		 05h	BYTE	number of FATs
		 06h	WORD	number of root dir entries
		 08h	WORD	total sectors (refer to offset 15h if zero)
		 0Ah	BYTE	media descriptor, 00h if unknown
		 0Bh	WORD	sectors per FAT
		 0Dh	WORD	sectors per track
		 0Fh	WORD	number of heads
		 11h	DWORD	number of hidden sectors
		 15h	DWORD	total sectors if WORD at 08h is zero
 1Fh	BYTE	flags
		bit 6: 16-bit FAT instead of 12-bit
		bit 7: unsupportable disk (all accesses will return Not Ready)
 20h	WORD	device-open count
 22h	BYTE	device type (see #01561 at INT 21/AX=440Dh"DOS 3.2+")
 23h	WORD	bit flags describing drive (see #02604)
 25h	WORD	number of cylinders (for partition only, if hard disk)
 27h 25 BYTEs	BIOS Parameter Block for default (highest) capacity supported
 40h  6 BYTEs	reserved (part of BPB above)
 46h	BYTE	last track accessed
---removable media---
 47h	DWORD	time of last access in clock ticks (FFFFFFFFh if never)
---fixed media---
 47h	WORD	partition (FFFFh = primary, 0001h = extended)
		always 0001h for DOS 5+
 49h	WORD	absolute cylinder number of partition's start on physical drive
		(FFFFh if primary partition in DOS 4.x)
------
 4Bh 11 BYTEs	volume label or "NO NAME    " if none (apparently taken from
		  extended boot record rather than root directory)
 56h	BYTE	terminating null for volume label
 57h	DWORD	serial number
 5Bh  8 BYTEs	filesystem type ("FAT12	  " or "FAT16	")
 63h	BYTE	terminating null for filesystem type
SeeAlso: #02601,#02602

Bitfields for flags describing drive:
Bit(s)	Description	(Table 02604)
 0	fixed media
 1	door lock ("changeline") supported
 2	current BPB locked
 3	all sectors in a track are the same size
 4	physical drive has multiple logical units
 5	current logical drive for shared physical drive
 6	disk change detected
 7	device parameters were changed (set DASD before formatting)
	(see #01560 at INT 21/AX=440Dh"DOS 3.2+")
 8	disk reformatted (BPB of current media was changed)
 9	access flag (fixed media only, disables reads and writes)
	(see #01566 at INT 21/AX=440Dh"DOS 3.2+")

INT 2F - SHARE - INSTALLATION CHECK
	AX = 1000h
Return: AL = status
	    00h not installed, OK to install
	    01h not installed, not OK to install
	    FFh installed
Notes:	supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh
	if DOS 4.01 SHARE was automatically loaded, file sharing is in an
	  inactive state (due to the undocumented /NC flag used by the autoload
	  code) until this call is made
	DR DOS 5.0 SHARE 1.00 only checks for AH=10h and in this case does not
	  chain to a previous handler, DR DOS 6.0 SHARE 1.02+ properly chains
	  for any values other than AX=1000h and the private FDOS hook
	  AX=1001h.  However, under DR PalmDOS and Novell DOS 7+, the
	  SHARE 2.00+ only tests for the AX=1000h install check, since it no
	  longer uses AX=1001h to hook into the system.
	DOS 5+ chains to the previous handler if AL <> 00h on entry
	Windows Enhanced mode hooks this call and reports that SHARE is
	  installed even when it is not
BUGS:	values of AL other than 00h put DOS 3.x SHARE into an infinite loop
	  (08E9: OR  AL,AL
	   08EB: JNZ 08EB) <- the buggy instruction (DOS 3.3)
	values of AL other than described here put PC-DOS 4.00 into the same
	  loop (the buggy instructions are the same)
SeeAlso: AX=1080h,INT 21/AH=52h,INT 21/AX=4457h/DX=FFFFh

INT 2F U - DR DOS 6.0+ FDOS EXTENSIONS - INSTALL FDOS HOOK (SHARE / DELWATCH)
	AX = 1001h
	DX:BX -> new FDOS stub entry function
Return: nothing
Notes:	the default handler for the pointer set by this call under DELWATCH
	  simply returns with CF set
	In Digital Research terminology FDOS is the part of the BDOS kernel
	  (IBMDOS.COM) responsible for the file system and related tasks, and
	  its functionality is also used by the BDOS kernel itself. However,
	  for reasons of performance and code size, it uses direct calling.
	This interrupt allows external components like SHARE file locking or
	  DELWATCH delete tracking software to hook into the internal backdoor
	  INT 2F/AH=10h/AL<=09h chain in the kernel, so that they can actually
	  allows the kernel to ensure that several conditions are met when
	  passing control to these registered components including proper
	  maintaining A20, re-enterancy, or critical section mutexing
	  (e.g. getting the disk sub-system queue "MXdisk").
	The default handler in the BDOS just sets the carry flag and returns.
	Currently known clients to this shared interface are DR DOS 6.0
	  SHARE 1.xx, DR DOS 6.0+ DELWATCH 1.00+, which both chain onto
	  the same call far address, and the version of AddStor's SuperStor
	  which is bundled with DR DOS 6.0
	However, the DR PalmDOS, and Novell DOS 7 - DR-DOS 7.03 SHARE 2.00-2.05
	  do not use this function to hook into the system. Instead they fix up
	  the share stubs directly. DR PalmDOS SHARE 2.00 uses the stubs at
	  Table !!! INT 21/AH=52h, while Novell DOS 7 - DR-DOS 7.03
	  SHARE 2.01-2.05 use the private set of share stubs at Table !!! at
	  INT 21/AX=4458h).  Future releases may possibly again fix up the
	  share stubs at INT 21/AH=52h.
SeeAlso: AX=1000h,AX=F800h

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - READ BUFFERS
	AX = 1002h
	CH = FFh (pre-read required)
	CL = buffer type (here FAT, DIR, or DATA, see below)
	AH:DX = 24 bit sector number
Return:	ES:SI -> buffer control block
Notes:	This private function is called internally by the OS kernel to
	  ask the FDOS to find the corresponding buffer.  By using the
	  INT 2F/AX=1001h FDOS hook, the call can be intercepted by external
	  system components such as the DELWATCH TSR.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1003h,AX=1008h,AX=1009h,AX=10FEh

Bitfields for Novell DOS 7 FDOS buffer type:
Bit(s)	Description	(Table 04099)
 7	remote (on a network drive)
 6	dirty (modified)
 3	data sector
 2	directory sector
 1	FAT sector

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - FLUSH BUFFERS
	AX = 1003h
	BL = drive???
	BH = buffer type to flush (BF_ISFAT+BF_ISDIR+BF_ISDATA)
Return: nothing???
Notes:	This private function is called internally by the OS kernel to
	  ask the FDOS to flush all buffer.  By using the INT 2F/AX=1001h FDOS
	  hook, the call can be intercepted by external system components such
	  as the DELWATCH TSR.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1004h,AX=10FEh

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - FREE FAT CHAIN
	AX = 1004h
	BX = first block to release on current drive
Return: nothing
Notes:	This private function is called internally by the OS kernel to
	  ask the FDOS to release the FAT chain.  By using the INT 2F/AX=1001h
	  FDOS hook, the call can be intercepted by external system components
	  such as the DELWATCH TSR.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1005h,AX=10FEh

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - ALLOCATE CLUSTER
	AX = 1005h
	BX = block from which to start search (e.g. current end of file)
	    0000h = start of disk
Return: AX or BX??? = allocated cluster (already marked as End of Chain)
	    or 0000h if none available
Notes:	This private function is called internally by the OS kernel to
	  ask the FDOS to allocate disk space.  By using the
	  INT 2F/AX=1001h FDOS hook, the call can be intercepted by external
	  system components such as the DELWATCH TSR.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1004h,AX=1007h,AX=10FEh

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - NEXT CLUSTER / READ FAT???
	AX = 1006h
	BX = current cluster number
Return:	AX or BX??? = next cluster in chain
Notes:	This private function is called internally by the OS kernel to
	  ask the FDOS to get the next cluster in a file.  By using the
	  INT 2F/AX=1001h FDOS hook, the call can be intercepted by external
	  system components such as the DELWATCH TSR.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1005h,AX=1007h,AX=10FEh

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - UPDATE FAT ENTRY / WRITE FAT???
	AX = 1007h
	BX = FAT entry to change
	DX = new value
Return:	nothing
Notes:	This private function is called internally by the OS kernel to
	  ask the FDOS to update the FAT.  By using the INT 2F/AX=1001h FDOS
	  hook, the call can be intercepted by external system components such
	  as the DELWATCH TSR.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1005h,AX=1006h,AX=1008h,AX=10FEh

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - FIXUP CHECKSUMS / DIR UPDATE???
	AX = 1008h
	BX = segment of directory buffer
	CX = cluster to fixup (0 = root)
	DI = directory entry index (truncated to cluster if subdirectory)
	BX:SI -> directory entry (single entry for hashing)
Return:	nothing
Notes:	This private function is called internally by the OS kernel to
	  ask the FDOS to fixup hashing/checksums.  By using the
	  INT 2F/AX=1001h FDOS hook, the call can be intercepted by external
	  system components such as the DELWATCH TSR.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1007h,AX=1009h,AX=10FEh

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - DIRECTORY BUFFER INFO
	AX = 1009h
Return: ES:DI -> 128-byte directory record buffer
	ES:SI -> directory BCB structure (see #04101)
Notes:	This private function is called internally by the OS kernel.  By using
	  the INT 2F/AX=1001h FDOS hook, the call can be intercepted by
	  external system components such as the DELWATCH TSR.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=10FEh

Format of Novell DOS 7+ FDOS directory BCB:
Offset	Size	Description	(Table 04101)
 00h	BYTE	drive (FFh = invalid)
 01h	BYTE	low byte of record number
 02h	BYTE	middle byte of record number
 03h	BYTE	high byte of record number

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - SUPERSTOR - QUERY PHYS FREE SPACE
	AX = 1010h
	CX = 0000h
Return: CX = free space
	    0000h if no physical space left on the drive
	    else there is still space available
Notes:	This private function is internally called by the FDOS part of the
	  OS kernel on "out of disk space" conditions.  It allows optimized
	  behaviour of DELWATCH delete tracking software in conjunction with
	  disk compression, and was implemented for SuperStor (but it would
	  also work with other disk compression if they hook this function).
	  If there truly is no physical space left on the drive, the FDOS asks
	  DELWATCH to purge files in its queue until enough space has been
	  freed, or there actually is no free disk space any more.
	By using the INT 2F/AX=1001h FDOS hook, the call can be intercepted by
	  external system components such as SuperStor, bundled with DR DOS
	  "Panther" and Novell DOS 7 BETAs.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=10FEh

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - CREATE PASSWORD ENTRY
	AX = 1020h
	???
Return: ???
Notes:	This private function is called internally by the OS kernel to an
	  optional SECURITY TSR.  By using the INT 2F/AX=1001h FDOS hook, it
	  can be intercepted by external system components such as
	  Multiuser SECURITY, bundled with DR DOS "Panther" Beta 1.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1021h,AX=1022h,AX=10FEh

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - CHANGE PASSWORD ENTRY
	AX = 1021h
	CL > 05h ???
	BX -> matching directory entry???
	AL = directory attributes???
Return: ???
	CF set on error (password change not allowed)
Notes:	This private function is called internally by the OS kernel to an
	  optional SECURITY TSR.  By using the INT 2F/AX=1001h FDOS hook, it
	  can be intercepted by external system components such as
	  Multiuser SECURITY, bundled with DR DOS "Panther" Beta 1.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1020h,AX=1022h,AX=10FEh

INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - CHECK PASSWORD ENTRY
	AX = 1022h
	???
Return: ???
Notes:	This private function is called internally by the OS kernel to an
	  optional SECURITY TSR.  By using the INT 2F/AX=1001h FDOS hook, it
	  can be intercepted by external system components such as
	  Multiuser SECURITY, bundled with DR DOS "Panther" Beta 1.
	This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1020h,AX=1021h,AX=10FEh

INT 2F U - DOS 4 only SHARE internal - ???
	AX = 1040h
	???
Return: AL = FFh???
SeeAlso: AX=1000h

INT 2F U - DOS 4 only SHARE internal - TURN ON FILE SHARING CHECKS
	AX = 1080h
Return: AL = status
	    F0h successful
	    FFh checking was already on
Note:	DOS 4.x SHARE has dual functions: FCB support for large (>32M) media
	  and file sharing checks.  The undocumented commandline flag /NC can
	  be used to disable the sharing code.
SeeAlso: AX=1000h,AX=1081h

INT 2F U - DOS 4 only SHARE internal - TURN OFF FILE SHARING CHECKS
	AX = 1081h
Return: AL = status
	    F0h successful
	    FFh checking was already off
Note:	(see AX=1080h)
SeeAlso: AX=1000h,AX=1080h

INT 2F U - DR DOS 6.0+ DELWATCH.EXE - INSTALLATION CHECK
	AX = 10FEh
Return: AL = FFh if installed and active
	    AH = internal version number
	        10h for DR DOS 6.0 DELWATCH 1.0 / 1.1 (through 1993/03/19)
		20h for Novell DOS 7+ DELWATCH 2.0+
	    DX:BX -> private entry point (see #02605)
Notes:	The DR DOS 6.0 DELWATCH 1.x used to store information about deleted
	  files in a hidden file named @DLWATCH.DAT, however the Novell DOS 7+
	  DELWATCH 2.0+ stores all the info in previously unused fields in
	  the files' directory entries. (See table !!! at INT 21h/11h for
	  details). This, however, now causes problems on systems also running
	  Windows 9x since Microsoft decided to use a rather similar but
	  incompatible method to store long filenames etc. in these entries.
	Running DELWATCH 2.x on a system which previously used DELWATCH 1.x,
	  the @DLWATCH.DAT file will be abandoned and converted to the new
	  method.
SeeAlso: #01352,INT 21/AX=4306h,INT 21/AX=5704h,INT 2F/AX=1001h

(Table 02605)
Call DELWATCH private entry point with:
	AH = function
	    00h (OS hook) installation check
		AL = 00h required for DELWATCH 1.x
		Return: CF clear
			AX = 0000h
			CX = 0004h (unsupported function)
	    01h (DELWATCH 1.x) New Disk
	        ???
	    01h (DELWATCH 2.0+) disable DELWATCH on drive
		AL = drive number (00h = A:)
		Return: AX = status (0000h if failed, FFFFh if successful)
	    02h (OS hook) Delete File
		AL = drive number (00h = A:)
		DX = directory cluster number (0000h for root directory)
		CX = directory entry number
		DS:BX -> directory entry
		ES,DS must be valid selectors if called in protected mode
		Return: DS:BX -> updated directory entry
			CF set if file is to be deleted by the OS
			CF clear if DELWATCH has placed the file in its queue
		Note:	deletes the directory entry
	    03h	(OS hook) Free Clusters
		AL = drive number (00h = A:)
		CX = number of clusters currently free (do not free if > 1)
		DX = preferred 'search from cluster' (ignored by DELWATCH 2.0)
		Return: CF clear if clusters freed
			CF set if no clusters freed
			DX = new 'search from' cluster (one before first free)
	    04h (OS hook) free root directory entry
		AL = drive number (00h = A:)
		Return: CF set if no directory entry freed
	    05h (OS hook) return free space
		AL = drive number (00h = A:)
		CX = number of free clusters
		Return:	CX = updated number of free clusters
		Notes:	adds space used by "deleted" files to free space
			call is chained
	    06h enable DELWATCH on drive
		AL = drive number with bit 7 set (80h = A:, etc.)
			(DELWATCH 2.0+: set bit 6 for removable drives)
		BX = maximum files of same name in one directory to save
		CX = maximum files to save on this disk
		DS:DX -> MEMDESC??? for drive data (see #04104)
		DS:SI -> MEMDESC??? for DWLIST (see #04104)
		ES,DS must contain valid selectors if called in protected mode
		Return: AX = status
			    0000h failed
			    FFFFh successful
			CX = error code on failure (see #04102)
			    (0004h "wrong version" if AL < 80h on entry)
	    07h (DELWATCH 1.x) disable DELWATCH on drive
		???
	    07h (DELWATCH 2.0+) (OS hook) new disk
		AL = drive (00h = A:, etc.)
		ES:BX -> DOS DDSC structure
		CF set if not enabled
		Return: ???
	    08h set file extensions list
		AL = sense (00h exclude named extensions, 01h only named ext.)
		DS:BX -> 31-byte ASCIZ extension list (three blank-padded bytes
			  per extension)
		Return: AX = FFFFh (successful)
	    09h	adjust pending delete space
		AL = drive number (00h = A:)
		CX = number of clusters being freed
		Return: AX = 0000h if drive not enabled
	    0Ah remove DELWATCH entry
		AL = drive number (00h = A:)
		DX = directory cluster number (0000h if root directory)
		CX = directory entry number
		BX:SI -> filename
		ES,DS must contain valid selectors if called in protected mode
		Return: AX > 0000h if entry found in DWLIST
	    0Bh enable NEWDISK
		Return: AX > 0000h if successful (FFFFh for DELWATCH 2.0)
		see also function 0Dh
	    0Ch (DELWATCH 1.x) drive status
		AL = drive number (00h = A:, etc.)
		Return: AX = drive data segment, 0000h if not enabled
			CX = pending delete space, if drive enabled
	    0Ch (DELWATCH 2.0+) check if drive enabled
		AL = drive number with bit 7 set (80h = A:, etc.)
		DS:DX -> MEMDESC for drive data (see #04104)
			(DX = 0000h if not required)
		DS:SI -> MEMDESC for DWLIST (see #04104)
			(SI = 0000h if not required)
		ES,DS must contain valid selectors if called in protected mode
		Return: AX = drive status (see also #04103)
			    0000h disabled or error
				CX = error code (see #04102)
			    0001h drive enabled
				CX = pending delete space, FFFFh if NEWDISK
				      not yet called
	    0Dh disable NEWDISK
		BX = segment address of bitmap buffer
		Return: AX > 0000h if successful (FFFFh for DELWATCH 2.0)
		see also function 0Bh
	    0Eh (DELWATCH 2.0+) (OS hook) purge file
		AL = drive number (00h = A:)
		DX = directory cluster number (0000h if root directory)
		CX = directory entry number
		Return: CF set if drive not enabled
			CF clear
			    AX = status
				0000h successfully purged
				else error code (see #04102)
	    0Fh (DELWATCH 2.0+) (OS hook) undelete file
		AL = drive number (00h = A:)
		DX = directory cluster number (0000h if root directory)
		CX = directory entry number
		Return: CF set if drive not enabled
			CF clear
			    AX = status
				0000h successfully undeleted
				else error code (see #04102)
Return: AX = 0000h, CX = 0001h (see #04102) if DELWATCH busy
	registers unchanged if AH > 0Fh on entry
Notes:	functions marked "OS hook" must under no circumstances by called by
	  external applications, as this would bypass the serialization
	  performed by the kernel and cause problems at least in multitasking
	  environments.
	two functions have been swapped between DELWATCH 1.x and DELWATCH 2.0
	  to ensure that DELWATCH 1.x calls will not do anything under newer
	  versions of the OS; for the same reason, the drive number in AL
	  sometimes requires that bit 7 be set for DELWATCH 2.0+.
SeeAlso: AX=1001h,AX=1010h

(Table 04102)
Values for DELWATCH error codes:
 0001h	reentered (DELWATCH busy)
 0002h	not enabled
 0003h	not found
 0004h	wrong version of DELWATCH
 0005h	memory allocation
SeeAlso: #04103

(Table 04103)
Values for DELWATCH drive status:
 0000h	drive not enabled
 0001h	OK
 0002h	no bitmap
 0003h	zero files
 0004h	cross-linked files
SeeAlso: #04102

Format of DELWATCH MEMDESC structure:
Offset	Size	Description	(Table 04104)
 00h	BYTE	memory type
		01h protected mode (DPMS)
		02h XMS
		03h upper (high) memory
		04h low memory
 01h	DWORD	location
		(conventional memory) WORD: segment base address
		(XMS) WORD: XMS handle
		(DPMS) DWORD: DPMS memory 32-bit base address
 05h	DWORD	length in bytes
 09h	DWORD	allocation
		(conventional memory) WORD: memory block segment
		(XMS) WORD: XMS handle (same as location handle)
		(DPMS) DWORD: DPMS 32-bit handle

INT 2F U - DR DOS 5.0 - FIXUP SHARE STUB TABLE???
	AX = 10FFh
	ES:BX -> new SHARE stub table to use???
Return: DS destroyed???
Notes:	Sets a pointer in the kernel. ES:BX points to a structure in SHARE's
	  segment, which presumeably contains a number (4 or 11???) of entries
	  of 5 bytes each and is probably part of some kind of share stub
	  dispatcher that gets fixed up by this call.
	This was seen called by DR DOS 5.0 SHARE 1.00 (when INT 2F/AX=1000h
	  revealed that SHARE was not installed) before it hooked INT 2Fh
	  via INT 21/AH=35h to provide its install check function. It preserved
	  the DS register before calling.
	However, the DR DOS 6.0+ SHARE 1.02+ uses INT 2F/AX=1001h to hook
	  into the OS, DR PalmDOS SHARE 2.00 directly fixes up the share stubs
	  in table !!! at INT 21h/52h, and Novell DOS 7 - DR-DOS 7.03
	  SHARE 2.01-2.05 maintains the private set of share stubs in
	  Table !!! at INT 21/AX=4458h).
	This function was probably used between 1990/02/09 and 1991/03/15.
SeeAlso: INT 2F/AX=1001h

INT 2F C - NETWORK REDIRECTOR - INSTALLATION CHECK
	AX = 1100h
Return: AL = status
	    00h not installed, OK to install
	    01h not installed, not OK to install
	    FFh installed
		AH = product identifier (ad hoc by various manufacturers)
		    00h if PC Tools v8 DRIVEMAP
		    42h ('B') for Beame&Whiteside BWNFS v3.0a
		    6Eh ('n') for NetWare Lite v1.1 CLIENT
Notes:	this function is called by the DOS 3.1+ kernel
	in DOS 4.x only, the 11xx calls are all in IFSFUNC.EXE, not in the
	  PC LAN Program redirector; DOS 5+ moves the calls back into the
	  redirector
	the PC Network 1.00 redirector (renamed to PC LAN Program in 1.1-1.3)
	  only supports AL=00h-27h

INT 2F - MSCDEX (MS CD-ROM Extensions) - INSTALLATION CHECK
	AX = 1100h subfn DADAh
	STACK: WORD DADAh
Return: AL = status
	    00h not installed, OK to install
		STACK unchanged
	    01h not installed, not OK to install
		STACK unchanged
	    FFh installed
		STACK: WORD	ADADh if MSCDEX installed
				DADBh if Lotus CD/Networker installed
Note:	although MSCDEX sets the stack word to ADADh on return, any value other
	  than DADAh is considered to mean that MSCDEX is already installed;
	  Lotus CD/Networker v4+ uses this feature to fool MSCDEX into
	  thinking it is already installed when it is in fact CD/Networker
	  that is installed
Index:	installation check;Lotus CD/Networker
Index:	Lotus CD/Networker;installation check

INT 2F CU - NETWORK REDIRECTOR - REMOVE REMOTE DIRECTORY
	AX = 1101h
	SS = DOS DS
	SDA first filename pointer -> fully-qualified directory name
	SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1103h,AX=1105h,INT 21/AH=3Ah,INT 21/AH=60h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - REMOVE REMOTE DIRECTORY
	AX = 1102h
	SS = DOS DS
	SDA first filename pointer -> fully-qualified directory name
	SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
Note:	appears to be identical to AX=1101h; MS internal documentation calls
	  this function "SEQ_RMDIR"
SeeAlso: AX=1101h

INT 2F CU - NETWORK REDIRECTOR - MAKE REMOTE DIRECTORY
	AX = 1103h
	SS = DOS DS
	SDA first filename pointer -> fully-qualified directory name
	SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1101h,AX=1105h,INT 21/AH=39h,INT 21/AH=60h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - MAKE REMOTE DIRECTORY
	AX = 1104h
	SS = DOS DS
	SDA first filename pointer -> fully-qualified directory name
	SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
Note:	appears to be identical to AX=1103h
SeeAlso: AX=1103h

INT 2F CU - NETWORK REDIRECTOR - CHDIR
	AX = 1105h
	SS = DOS DS
	SDA first filename pointer -> fully-qualified directory name
	SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    CDS updated with new path
Notes:	this function is called by the DOS 3.1+ kernel
	directory string in CDS should not have a terminating backslash unless
	  the current directory is the root
SeeAlso: AX=1101h,AX=1103h,INT 21/AH=3Bh,INT 21/AH=60h

INT 2F CU - NETWORK REDIRECTOR - CLOSE REMOTE FILE
	AX = 1106h
	ES:DI -> filled-in SFT (assumed to point at SDA's current SFT field)
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    SFT updated (redirector must decrement open count, which may be
		  done with INT 2F/AX=1208h)
	ES:DI must be preserved
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1116h,AX=1201h,AX=1208h,AX=1227h,INT 21/AH=3Eh

INT 2F CU - NETWORK REDIRECTOR - COMMIT REMOTE FILE
	AX = 1107h
	ES:DI -> filled-in SFT (assumed to point at SDA's current SFT field)
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    all buffers for file flushed
	    directory entry updated
	ES:DI must be preserved
Desc:	perform all the buffer flushing, directory updates, etc. that would be
	  performed on a file close, but do not decrement the SFT reference
	  count
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AH=68h,INT 21/AX=5D01h

INT 2F CU - NETWORK REDIRECTOR - READ FROM REMOTE FILE
	AX = 1108h
	ES:DI -> SFT
	    SFT DPB field -> DPB of drive containing file
	CX = number of bytes
	SS = DOS DS
	SDA DTA field -> user buffer
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    CX = number of bytes read (0000h = end of file)
	    SFT updated
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1109h,AX=1229h,INT 21/AH=3Fh"DOS",INT 21/AX=5D06h

INT 2F CU - NETWORK REDIRECTOR - WRITE TO REMOTE FILE
	AX = 1109h
	ES:DI -> SFT
	    SFT DPB field -> DPB of drive containing file
	CX = number of bytes
	SS = DOS DS
	SDA DTA field -> user buffer
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    CX = number of bytes written
	    SFT updated
Notes:	this function is called by the DOS 3.1+ kernel
	PrintCache v3.1 PCACHE.EXE intercepts this function for SFTs where
	  the Device Driver Header field points at PCACHE, but does not
	  intercept any other network redirector functions
SeeAlso: AX=1107h,AX=1108h,INT 21/AH=40h,INT 21/AX=5D06h

INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - LOCK REGION OF FILE
	AX = 110Ah
	BX = file handle
	CX:DX = starting offset
	SI = high word of size
	STACK: WORD low word of size
	ES:DI -> SFT
	    SFT DPB field -> DPB of drive containing file
	SS = DOS DS
Return: CF set on error
	   AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	STACK unchanged
Notes:	this function is called by the DOS 3.10-3.31 kernel
	the redirector is expected to resolve lock conflicts
SeeAlso: AX=110Bh,INT 21/AH=5Ch

INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - LOCK/UNLOCK REGION OF FILE
	AX = 110Ah
	BL = function
	    00h lock
	    01h unlock
	CX = number of lock/unlock parameters (0001h for DOS 4.0-6.1)
	DS:DX -> parameter block (see #02606)
	ES:DI -> SFT
	    SFT DPB field -> DPB of drive containing file
	SS = DOS DS
Return: CF set on error
	   AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
Notes:	this function is called by the DOS 4.0+ kernel
	the redirector is expected to resolve lock conflicts
SeeAlso: AX=110Bh,INT 21/AH=5Ch

Format of parameter block entry [array, but currently limited to single entry]:
Offset	Size	Description	(Table 02606)
 00h	DWORD	start offset
 04h	DWORD	size of region

INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - UNLOCK REGION OF FILE
	AX = 110Bh
	BX = file handle
	CX:DX = starting offset
	SI = high word of size
	STACK: WORD low word of size
	ES:DI -> SFT for file
	    SFT DPB field -> DPB of drive containing file
Return: CF set on error
	   AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	STACK unchanged
Note:	this function is called by the DOS 3.1-3.31 kernel; DOS 4.0+ calls
	  AX=110Ah instead
SeeAlso: AX=110Ah,INT 21/AH=5Ch

INT 2F CU - NETWORK REDIRECTOR - GET DISK INFORMATION
	AX = 110Ch
	ES:DI -> current directory structure for desired drive
Return: CF clear if data valid
	    AL = sectors per cluster
	    AH = media ID byte
	    BX = total clusters
	    CX = bytes per sector
	    DX = number of available clusters
	CF set if data invalid
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AH=36h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - SET REMOTE FILE'S ATTRIBUTES
	AX = 110Dh
	SDA first filename pointer -> name of file
	???
Return: ???
Note:	similar to AX=110Eh
SeeAlso: AX=110Eh

INT 2F CU - NETWORK REDIRECTOR - SET REMOTE FILE'S ATTRIBUTES
	AX = 110Eh
	SS = DOS DS
	SDA first filename pointer -> fully-qualified name of file
	SDA CDS pointer -> current directory structure for drive with file
	STACK: WORD new file attributes
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	STACK unchanged
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=110Dh,AX=110Fh,INT 21/AX=4301h,INT 21/AH=60h

INT 2F CU - NETWORK REDIRECTOR - GET REMOTE FILE'S ATTRIBUTES AND SIZE
	AX = 110Fh
	SS = DOS DS
	SDA first filename pointer -> fully-qualified name of file
	SDA CDS pointer -> current directory structure for drive with file
		(offset = FFFFh if null CDS [net direct request])
	SDA search attributes = mask of attributes which may be included in
		  search for file
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    AX = file attributes
	    BX:DI = file size
	    CX = time stamp of file
	    DX = date stamp of file
Notes:	this function is called by the DOS 3.1+ kernel
	wildcards and device names are not permitted
SeeAlso: AX=110Eh,INT 21/AX=4300h,INT 21/AH=60h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET REMOTE FILE'S ATTRIBUTES AND SIZE
	AX = 1110h
	SDA first filename pointer -> name of file
	???
Return: ???
Note:	appears to be similar to AX=110Fh
SeeAlso: AX=110Eh

INT 2F CU - NETWORK REDIRECTOR - RENAME REMOTE FILE
	AX = 1111h
	SS = DS = DOS DS
	SDA first filename pointer = offset of fully-qualified old name
	SDA second filename pointer = offset of fully-qualified new name
	SDA CDS pointer -> current directory structure for drive with file
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1112h,INT 21/AH=56h,INT 21/AH=60h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - RENAME REMOTE FILE
	AX = 1112h
	SS = DS = DOS DS
	SDA first filename pointer -> name of file
	???
Return: ???
Note:	similar to AX=1111h
SeeAlso: AX=1111h

INT 2F CU - NETWORK REDIRECTOR - DELETE REMOTE FILE
	AX = 1113h
	SS = DS = DOS DS
	SDA first filename pointer -> fully-qualified filename in DOS DS
	SDA CDS pointer -> current directory structure for drive with file
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
Notes:	this function is called by the DOS 3.1+ kernel
	the filespec may contain wildcards
SeeAlso: AX=1114h,INT 21/AH=41h,INT 21/AH=60h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - DELETE REMOTE FILE
	AX = 1114h
	SDA first filename pointer -> name of file
	???
Return: ???
Note:	similar to AX=1113h
SeeAlso: AX=1113h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - OPEN REMOTE FILE
	AX = 1115h
	SS = DOS DS
	ES:DI -> SFT ???
	???
Return: ???
Note:	similar to AX=1116h
SeeAlso: AX=1116h,AX=112Eh

INT 2F CU - NETWORK REDIRECTOR - OPEN EXISTING REMOTE FILE
	AX = 1116h
	ES:DI -> uninitialized SFT
	SS = DOS DS
	SDA first filename pointer -> fully-qualified name of file to open
	STACK: WORD file access and sharing modes (see #01402 at INT 21/AH=3Dh)
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    SFT filled (except handle count, which DOS manages itself)
	STACK unchanged
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1106h,AX=1115h,AX=1117h,AX=1118h,AX=112Eh,INT 21/AH=3Dh
SeeAlso: INT 21/AH=60h

INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE REMOTE FILE
	AX = 1117h
	ES:DI -> uninitialized SFT
	SS = DOS DS
	SDA first filename pointer -> fully-qualified name of file to open
	SDA CDS pointer -> current directory structure for drive with file
	STACK: WORD file creation mode
			low byte = file attributes (see #01401 at INT 21/AH=3Ch)
			high byte = 00h normal create, 01h create new file
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    SFT filled (except handle count, which DOS manages itself)
	STACK unchanged
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1106h,AX=1116h,AX=1118h,AX=112Eh,INT 21/AH=3Ch,INT 21/AH=60h

INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE FILE WITHOUT CDS
	AX = 1118h
	ES:DI -> uninitialized SFT
	SS = DOS DS
	SDA first filename pointer -> fully-qualified name of file
	STACK: WORD file creation mode
			low byte = file attributes
			high byte = 00h normal create, 01h create new file
Return: ???
	STACK unchanged
Note:	this function is called by the DOS 3.1+ kernel when creating a file
	  on a drive for which the SDA CDS pointer has offset FFFFh
SeeAlso: AX=1106h,AX=1116h,AX=1117h,AX=112Eh,INT 21/AH=60h

INT 2F CU - NETWORK REDIRECTOR - FIND FIRST FILE WITHOUT CDS
	AX = 1119h
	SS = DS = DOS DS
	[DTA] = uninitialized 21-byte findfirst search data
	      (see #01626 at INT 21/AH=4Eh)
	SDA first filename pointer -> fully-qualified search template
	SDA search attribute = attribute mask for search
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    [DTA] = updated findfirst search data
		    (bit 7 of first byte must be set)
	    [DTA+15h] = standard directory entry for file (see #01352)
Notes:	this function is called by the DOS 3.1+ kernel
	DOS 4.x IFSFUNC returns CF set, AX=0003h
SeeAlso: AX=111Ah,AX=111Bh,INT 21/AH=1Ah

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - FIND NEXT FILE WITHOUT CDS
	AX = 111Ah
	???
Return: CF set
	    AX = error code (03h for DOS 4.01 IFSFUNC)
Note:	use AX=111Ch for DOS 5+
SeeAlso: AX=1119h,AX=111Ch

INT 2F CU - NETWORK REDIRECTOR - FINDFIRST
	AX = 111Bh
	SS = DS = DOS DS
	[DTA] = uninitialized 21-byte findfirst search data
	      (see #01626 at INT 21/AH=4Eh)
	SDA first filename pointer -> fully-qualified search template
	SDA CDS pointer -> current directory structure for drive with file
	SDA search attribute = attribute mask for search
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    [DTA] = updated findfirst search data
		    (bit 7 of first byte must be set)
	    [DTA+15h] = standard directory entry for file (see #01352)
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1119h,AX=111Ch,INT 21/AH=1Ah,INT 21/AH=4Eh,INT 21/AH=60h

INT 2F CU - NETWORK REDIRECTOR - FINDNEXT
	AX = 111Ch
	SS = DS = DOS DS
	ES:DI -> CDS
	ES:DI -> DTA (MSDOS v5.0)
	[DTA] = 21-byte findfirst search data
	      (see #01626 at INT 21/AH=4Eh)
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    [DTA] = updated findfirst search data
		    (bit 7 of first byte must be set)
	    [DTA+15h] = standard directory entry for file (see #01352)
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1119h,AX=111Bh,INT 21/AH=1Ah,INT 21/AH=4Fh

INT 2F CU - NETWORK REDIRECTOR - CLOSE ALL REMOTE FILES FOR PROCESS (ABORT)
	AX = 111Dh
	SS = DOS DS
	SDA PSP segment field = PSP of terminating process
Return: nothing
Notes:	used when a process is aborted; the process being terminated is
	  indicated by the "sharing PSP" field in the SDA (offset 1Ah/1Ch)
	this function is called by the DOS 3.1+ kernel
	closes all FCBs opened by process
SeeAlso: INT 21/AX=5D04h

INT 2F CU - NETWORK REDIRECTOR - DO REDIRECTION
	AX = 111Eh
	SS = DOS DS
	STACK: WORD function to execute
		5F00h  get redirection mode
			BL = type (03h printer, 04h disk)
			Return: BH = state (00h off, 01h on)
		5F01h  set redirection mode
			BL = type (03h printer, 04h disk)
			BH = state (00h off, 01h on)
		5F02h  get redirection list entry
			BX = redirection list index
			DS:SI -> 16-byte local device name buffer
			ES:DI -> 128-byte network name buffer
			Return: must set user's BX to device type and CX to
				stored parameter value, using AX=1218h to get
				stack frame address
		5F03h  redirect device
			BL = device type (see INT 21/AX=5F03h)
			CX = stored parameter value
			DS:SI -> ASCIZ source device name
			ES:DI -> destination ASCIZ network path + ASCIZ passwd
		5F04h  cancel redirection
			DS:SI -> ASCIZ device name or network path
		5F05h  get redirection list extended entry
			BX = redirection list index
			DS:SI -> buffer for ASCIZ source device name
			ES:DI -> buffer for destination ASCIZ network path
			Return: BH = status flag
				BL = type (03h printer, 04h disk)
				CX = stored parameter value
				BP = NETBIOS local session number
		5F06h  similar to 5F05h???
Return: CF set on error
	    AX = error code (see #01680 at INT 21/AH=59h/BX=0000h)
	STACK unchanged
Notes:	this function is called by the DOS 3.1+ kernel on INT 21/AH=5Fh
	  (including LAN Manager calls)
	the PC Network 1.00 redirector does not support function 5F06h
SeeAlso: INT 21/AX=5F00h,INT 21/AX=5F01h,INT 21/AX=5F02h,INT 21/AX=5F03h
SeeAlso: INT 21/AX=5F04h,INT 21/AX=5F05h,INT 21/AX=5F06h

INT 2F CU - NETWORK REDIRECTOR - PRINTER SETUP
	AX = 111Fh
	STACK: WORD function
		5E02h  set printer setup
		5E03h  get printer setup
		5E04h  set printer mode
		5E05h  get printer mode
Return: CF set on error
	    AX = error code (see #01680 at INT 21/AH=59h/BX=0000h)
	STACK unchanged
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AX=5E02h,INT 21/AX=5E03h,INT 21/AX=5E04h,INT 21/AX=5E05h

INT 2F CU - NETWORK REDIRECTOR - FLUSH ALL DISK BUFFERS
	AX = 1120h
	DS = DOS DS
	???
Return: CF clear (successful)
Notes:	this function is called by the DOS 3.1+ kernel
	uses CDS array pointer and LASTDRIVE= entries in DOS list of lists
SeeAlso: INT 21/AH=0Dh,INT 21/AX=5D01h

INT 2F CU - NETWORK REDIRECTOR - SEEK FROM END OF REMOTE FILE
	AX = 1121h
	CX:DX = offset (in bytes) from end
	ES:DI -> SFT
	    SFT DPB field -> DPB of drive with file
	SS = DOS DS
Return: CF set on error
	    AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    DX:AX = new file position
Note:	this function is called by the DOS 3.1+ kernel, but only when seeking
	  from the end of a file opened with sharing modes set in such a
	  manner that another process is able to change the size of the file
	  while it is already open
SeeAlso: AX=1228h,INT 21/AH=42h

INT 2F CU - NETWORK REDIRECTOR - PROCESS TERMINATION HOOK
	AX = 1122h
	SS = DOS DS
	DS = PSP of process about to terminate
Return: ???
Notes:	this function is called by the DOS 3.1+ kernel
	after calling this function, the kernel calls INT 2F/AX=111Dh
SeeAlso: AX=111Dh,INT 21/AH=4Ch,INT 60/DI=0601h

INT 2F CU - NETWORK REDIRECTOR - QUALIFY REMOTE FILENAME
	AX = 1123h
	DS:SI -> ASCIZ filename to canonicalize
	ES:DI -> 128-byte buffer for qualified name
Return: CF set if not resolved
Notes:	called by MS-DOS 3.1+ kernel, but not called by DR DOS 5.0 unless the
	  filename matches the name of a character device
	called first when DOS attempts to resolve a filename (unless inside an
	  AX=5D00h server call); if this fails, DOS resolves the name locally
SeeAlso: AX=1221h,INT 21/AH=60h

INT 2F CU - NETWORK REDIRECTOR - TURN OFF REMOTE PRINTER
	AX = 1124h
	ES:DI -> SFT
	SS = DOS DS
	???
Return: CX = ???
Note:	this function is called by the DOS 3.1+ kernel if AX=1126h
	  returns CF set
SeeAlso: AX=1126h

INT 2F CU - NETWORK REDIRECTOR - REDIRECTED PRINTER MODE
	AX = 1125h
	STACK: WORD subfunction
		5D07h get print stream state
			Return: DL = current state
		5D08h set print stream state
			DL = new state
		5D09h finish print job
Return: CF set on error
	    AX = error code (see #01680 at INT 21/AH=59h/BX=0000h)
	STACK unchanged
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AX=5D07h,INT 21/AX=5D08h,INT 21/AX=5D09h

INT 2F CU - NETWORK REDIRECTOR - REMOTE PRINTER ECHO ON/OFF
	AX = 1126h
	ES:DI -> SFT for file handle 4???
	SS = DOS DS???
	???
Return: CF set on error
Notes:	this function is called by the DOS 3.1+ kernel
	called when print echoing (^P, ^PrtSc) changes state and STDPRN has
	  bit 11 of the device information word in the SFT set
SeeAlso: AX=1124h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
	AX = 1127h
Return: CF set
	    AX = 0001h (invalid function) (see #01680 at INT 21/AH=59h/BX=0000h)

INT 2F - NetWare 4.0 - REMOTE FILE COPY
	AX = 1127h
	BX = 4E57h ('NW') (signature identifying this as a NetWare call)
	SI = source file handle
	DI = destination file handle
	DX:CX = number of bytes to copy, starting at current file position
Return: CF clear if successful
	CF set on error
	    AX = error code (05h,06h,0Bh,11h,3Bh) (see #01680)
	DX:CX = number of bytes successfully copied (file position updated)
Notes:	this is the only call which may be made directly to the NetWare
	  redirector from an application
	COMMAND.COM's COPY and DOS's XCOPY reportedly call INT 21/AX=1127h in
	  order to speed up copies between files on the same network server;
	  if error code 11h (not same device) is returned, the copy is
	  performed in the usual manner.  However, no such calls appear to
	  be present in MS-DOS 6.22.
	From the DR DOS "Panther" BETA COMMAND.COM (1992/06/22) up to some of
	  the Novell DOS 7 COMMAND.COM updates (1994/09/12), the shell made
	  calls to INT 2F/AX=11F0h to attempt "remote server COPYing". However,
	  this was removed from later releases of the shell because it stopped
	  Performance Technologies' PowerLAN 3.1 working. (A successor of
	  the DR-DOS 7.03 COMMAND.COM may possibly reintroduce this remote
	  copy feature.	 Probably it would then try both INT 2F/AX=1127h and
	  INT 2F/AX=11F0h.)
SeeAlso: INT 2F/AX=11F0h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
	AX = 1128h
Return: CF set
	    AX = 0001h (invalid function) (see #01680 at INT 21/AH=59h/BX=0000h)

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
	AX = 1129h
Return: CF set
	    AX = 0001h (invalid function) (see #01680 at INT 21/AH=59h/BX=0000h)

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - CLOSE ALL FILES FOR PROCESS
	AX = 112Ah
	DS = DOS DS
	???
Return: ???
Note:	does something to each IFS driver

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GENERIC IOCTL
	AX = 112Bh
	SS = DOS DS
	CX = function/category
	DS:DX -> parameter block
	STACK: WORD value of AX on entry to INT 21 (440Ch or 440Dh)
	???
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
Note:	this function is called by the DOS 4.0 kernel

INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - "UPDATE_CB" - ???
	AX = 112Ch
	SS = DOS DS
	SDA current SFT pointer -> SFT for file
	???
Return: CF set on error
Note:	called by SHARE in DOS 5.0-6.0

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - EXTENDED ATTRIBUTES
	AX = 112Dh
	BL = subfunction (value of AL on INT 21)
	    02h get extended attributes
	    03h get extended attribute properties
	    04h set extended attributes
		Return: CF clear
	    else ???
		Return: CX = ??? (00h or 02h for DOS 4.01)
	ES:DI -> SFT for file
	SS = DOS DS
Return: DS = DOS DS
Note:	this function is called by the DOS 4.0 kernel on INT 21/AX=5702h,
	  INT 21/AX=5703h, and INT 21/AX=5704h
SeeAlso: INT 21/AX=5702h,INT 21/AX=5703h,INT 21/AX=5704h,INT 21/AH=6Eh

INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - EXTENDED OPEN/CREATE FILE
	AX = 112Eh
	SS = DS = DOS DS
	ES:DI -> uninitialized SFT for file
	STACK: WORD file attribute for created/truncated file
			low byte = file attributes
			high byte = 00h normal create/open, 01h create new file
	SDA first filename pointer -> fully-qualified filename
	SDA extended file open action = action code
	      (see #01770 at INT 21/AX=6C00h)
	SDA extended file open mode = open mode for file (see INT 21/AX=6C00h)
Return: CF set on error
	    AX = error code
	CF clear if successful
	    CX = result code
		01h file opened
		02h file created
		03h file replaced (truncated)
	    SFT initialized (except handle count, which DOS manages itself)
Note:	this function is called by the DOS 4.0+ kernel
BUG:	this function is not called correctly under some DOS versions
	  (at least 5.0 and 6.2):
	    the file attribute on the stack is not correct if the action
	      code is 11h,
	    the result code in CX is not passed back to the application.
SeeAlso: AX=1115h,AX=1116h,AX=1117h,INT 21/AX=6C00h

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - IFS IOCTL
	AX = 112Fh
	SS = DOS DS
	STACK: WORD function in low byte
		00h ???
		    DS:SI -> Current Directory Structure???
		    CL = drive (1=A:)
		01h ???
		    DS:SI -> ???
		    CL = file handle???
		02h ???
		    DS:SI -> Current Directory Structure???
		    DI = ???
		    CX = drive (1=A:)
	???
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
Note:	this function is called by the DOS 4.0 kernel
SeeAlso: INT 21/AH=6Bh

INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET IFSFUNC SEGMENT
	AX = 1130h
Return: ES = CS of resident IFSFUNC

INT 2F - LAN Manager Enhanced DOS Services - ???
	AX = 1180h
	???
Return: ???
SeeAlso: AX=1100h,AX=1181h,AX=118Eh

INT 2F - LAN Manager Enhanced DOS Services - SET USER NAME???
	AX = 1181h
	???
Return: ???
SeeAlso: AX=1100h,AX=1180h

INT 2F - LAN Manager Enhanced DOS Services - INSTALL SERVICE
	AX = 1182h
	???
Return: ???
SeeAlso: AX=1100h,AX=1180h

INT 2F - LAN Manager Enhanced DOS - ???
	AX = 1184h
	???
Return: ???

INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe
	AX = 1186h
	DS:SI -> stack frame (see #02607)
Return: CF clear if successful
	CF set if error
	    AX = error code
Note:	LAN Manager enhance mode adds features beyond the standard redirector
	  file/printer services
SeeAlso: AX=118Fh,AX=1190h,AX=1191h,INT 21/AX=5F39h

Format of LAN Manager DosReadAsynchNmPipe stack frame:
Offset	Size	Description	(Table 02607)
 00h	DWORD	-> number of bytes read
 04h	WORD	size of buffer
 06h	DWORD	-> buffer
 0Ah	DWORD	-> return code
 0Eh	DWORD	function to call on completion as function( char far *buffer )
 12h	WORD	handle

INT 2F - LAN Manager 2.0+ DOS Enhanced ENCRYPT.EXE - STREAM ENCRYPTION SERVICE
	AX = 118Ah
	BX = function (0000h or 0001h)
Return: CF clear if successful
	    AX = 1100h success
	CF set if error
	    AX = 0001h, etc.
SeeAlso: AX=1186h,AH=41h,AH=42h,AH=4Bh

INT 2F - LAN Manager Enhanced DOS - ???
	AX = 118Bh
	???
Return: ???

INT 2F - LAN Manager Enhanced DOS - ???
	AX = 118Ch
	???
Return: ???

INT 2F - LAN Manager Enhanced DOS - ???
	AX = 118Eh
	???
Return: ???

INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe
	AX = 118Fh
	DS:SI -> stack frame (see #02608)
Return: CF clear if successful
	CF set if error
	    AX = error code
SeeAlso: AX=1186h,AX=1191h,INT 21/AX=5F3Ah

Format of LAN Manager DosReadAsynchNmPipe stack frame:
Offset	Size	Description	(Table 02608)
 00h	DWORD	-> number of bytes read
 04h	WORD	Size of buffer
 06h	DWORD	-> buffer
 0Ah	DWORD	-> return code
 0Eh	DWORD	function to call on completion as function( char far *buffer )
 12h	WORD	handle

INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe2
	AX = 1190h
	DS:SI -> stack frame (see #02609)
Return: CF clear if successful
	CF set if error
	    AX = error code
SeeAlso: AX=1186h,AX=1191h

Format of LAN Manager DosReadAsynchNmPipe2 stack frame:
Offset	Size	Description	(Table 02609)
 00h	DWORD	-> number of bytes read
 04h	WORD	size of buffer
 06h	DWORD	-> buffer
 0Ah	DWORD	-> return code
 0Eh	DWORD	function to call on completion as function( char far *buffer )
 12h	WORD	handle
 14h	DWORD	???

INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe2
	AX = 1191h
	DS:SI -> stack frame (see #02610)
Return: CF clear if successful
	CF set if error
	    AX = error code
SeeAlso: AX=118Fh,AX=1190h,INT 21/AX=5F3Ah

Format of LAN Manager DosReadAsynchNmPipe2 stack frame:
Offset	Size	Description	(Table 02610)
 00h	DWORD	-> number of bytes read
 04h	WORD	size of buffer
 06h	DWORD	-> buffer
 0Ah	DWORD	-> return code
 0Eh	DWORD	function to call on completion as function( char far *buffer )
 12h	WORD	handle
 14h	DWORD	???

INT 2F - Novell ??? - REMOTE FILE COPY
	AX = 11F0h
	SI = source file handle
	DI = destination file handle
	DX:CX = number of bytes to copy, starting at current file position
	CF cleared
Return: CF clear:
	    AX = 11F0h	"no network there"
	    AX <> 11F0h if successful
	CF set on error "the request could not be handled"
	    AX = error code (05h,06h,0Bh,11h,3Bh) (see #01680)
	DX:CX = number of bytes successfully copied (file position updated)
Notes:	From the DR DOS "Panther" BETA COMMAND.COM (1992/06/22) up to some of
	  the Novell DOS 7 COMMAND.COM updates (1994/09/12), the shell made
	  calls to INT 2F/AX=11F0h to attempt "remote server COPYing". However,
	  this was removed from later releases of the shell because it 
	  interfered with Performance Technologies' PowerLAN 3.1. (A successor
	  of the DR-DOS 7.03 COMMAND.COM may possibly reintroduce this remote
	  copy feature. Probably it would then try both INT 2F/AX=1127h and
	  INT 2F/AX=11F0h.)
SeeAlso: INT 2F/AX=1127h

INT 2F U - DOS 3.0+ internal - INSTALLATION CHECK
	AX = 1200h
Return: AL = FFh (for compatibility with other INT 2F functions)

INT 2F U - DOS 3.0+ internal - CLOSE CURRENT FILE
	AX = 1201h
	SS = DOS DS = DOS kernel data seg (must be using a DOS internal stack)
	SDA current SFT pointer -> SFT of file to close
Return: CF set on error
	ES:DI -> SFT for file
	CX undefined (new reference count of SFT in many versions)
	BX destroyed
SeeAlso: AX=1106h,AX=1227h,INT 21/AH=3Eh

INT 2F U - DOS 3.0+ internal - GET INTERRUPT ADDRESS
	AX = 1202h
	STACK: WORD vector number
Return: ES:BX -> interrupt vector (DWORD containing handler's address)
	STACK unchanged

INT 2F U - DOS 3.0+ internal - GET DOS DATA SEGMENT
	AX = 1203h
Return: DS = data segment of IBMDOS.COM/MSDOS.SYS
Note:	for DOS prior to version 5.0, the data segment is the same as the code
	  segment

INT 2F U - DOS 3.0+ internal - NORMALIZE PATH SEPARATOR
	AX = 1204h
	STACK: WORD character to normalize
Return: AL = normalized character (forward slash turned to backslash, all
		  others unchanged)
	ZF set if path separator
	STACK unchanged

INT 2F U - DOS 3.0+ internal - OUTPUT CHARACTER TO STANDARD OUTPUT
	AX = 1205h
	STACK: WORD character to output
Return: STACK unchanged
Note:	can be called only from within DOS

INT 2F U - DOS 3.0+ internal - INVOKE CRITICAL ERROR
	AX = 1206h
	DI = error code
	BP:SI -> device driver header (see #01646)
	SS = DOS DS (must be using a DOS internal stack)
	STACK: WORD value to be passed to INT 24 in AX
Return: AL = 0-3 for Abort, Retry, Ignore, Fail
	STACK unchanged
SeeAlso: INT 24

INT 2F U - DOS 3.0+ internal - MAKE DISK BUFFER MOST-RECENTLY USED
	AX = 1207h
	DS:DI -> disk buffer
Return: nothing
Desc:	move the indicated buffer to the end of the disk buffer chain (least-
	  recently used is first); under DOS 3.3, the buffer is then moved to
	  the start of the disk buffer chain if it was marked unused
Notes:	can be called only from within DOS
	this function is nearly the same as AX=120Fh
SeeAlso: AX=120Fh

INT 2F U - DOS 3.0+ internal - DECREMENT SFT REFERENCE COUNT
	AX = 1208h
	ES:DI -> SFT
Return: AX = original value of reference count
Notes:	if the reference count was 1, it is set to FFFFh ("busy", since 0
	  indicates that the SFT is not in use).  It is the caller's
	  responsibility to set the reference count to zero after cleaning up.
	used by network redirectors such as MSCDEX
SeeAlso: AX=1106h

INT 2F U - DOS 3.0+ internal - FLUSH AND FREE DISK BUFFER
	AX = 1209h
	DS:DI -> disk buffer
Return: disk buffer marked unused, contents written to disk if buffer dirty
Note:	can be called only from within DOS
SeeAlso: AX=120Eh,AX=1215h

INT 2F U - DOS 3.0+ internal - PERFORM CRITICAL ERROR INTERRUPT
	AX = 120Ah
	DS = SS = DOS DS (must be using a DOS internal stack)
	STACK: WORD extended error code
Return: AL = user response (0=ignore, 1=retry, 2=abort, 3=fail)
	CF clear if retry, set otherwise
	STACK unchanged
Notes:	can only be called during a DOS function call, as it uses various
	  fields in the SDA to set up the registers for the INT 24
	reportedly sets current DPB's first root directory sector to 1
SeeAlso: INT 24

INT 2F U - DOS 3.0+ internal - SIGNAL SHARING VIOLATION TO USER
	AX = 120Bh
	ES:DI -> system file table entry for previous open of file
	STACK: WORD extended error code (should be 20h--sharing violation)
Return: CF clear if operation should be retried
	CF set if operation should not be retried
	    AX = error code (20h) (see #01680 at INT 21/AH=59h/BX=0000h)
	STACK unchanged
Notes:	can only be called during a DOS function call
	should only be called if an attempt was made to open an already-open
	  file contrary to the sharing rules
	invokes INT 24 if SFT file opened via FCB or in compatibility mode with
	  inheritance allowed

INT 2F U - DOS 3.0+ internal - OPEN DEVICE AND SET SFT OWNER/MODE
	AX = 120Ch
	SDA current SFT pointer -> SFT for file
	DS = DOS DS
	SS = DOS DS (must be using a DOS internal stack)
Return: ES, DI, AX destroyed
Notes:	invokes "device open" call on device driver for SFT
	changes owner of last-accessed SFT to calling process if it was opened
	  via FCB
	called by network redirectors such as MSCDEX

INT 2F U - DOS 3.0+ internal - GET DATE AND TIME
	AX = 120Dh
	SS = DOS DS (must be using a DOS internal stack)
Return: AX = current date in packed format (see #01666 at INT 21/AX=5700h)
	DX = current time in packed format (see #01665 at INT 21/AX=5700h)
SeeAlso: INT 21/AH=2Ah,INT 21/AH=2Ch

INT 2F U - DOS 3.0+ internal - MARK ALL DISK BUFFERS UNREFERENCED
	AX = 120Eh
	SS = DOS DS (must be using a DOS internal stack)
Return: DS:DI -> first disk buffer
Notes:	clears "referenced" flag on all disk buffers
	in DOS 5+, this has become essentially a NOP, invoking the same code
	  used by AX=1224h (SHARING DELAY)
SeeAlso: AX=1209h,AX=1210h,INT 21/AH=0Dh

INT 2F U - DOS 3.0+ internal - MAKE BUFFER MOST RECENTLY USED
	AX = 120Fh
	DS:DI -> disk buffer
	SS = DOS DS (must be using a DOS internal stack)
Return: DS:DI -> next buffer in buffer list
Desc:	move the indicated buffer to the end of the disk buffer chain (least-
	  recently used is first); under DOS 3.3, the buffer is then moved to
	  the start of the disk buffer chain if it was marked unused
Note:	this function is the same as AX=1207h except that it returns a
	  pointer to the buffer following the specified buffer in the buffer
	  chain
SeeAlso: AX=1207h

INT 2F U - DOS 3.0+ internal - FIND UNREFERENCED DISK BUFFER
	AX = 1210h
	DS:DI -> first disk buffer to check
Return: ZF clear if found
	    DS:DI -> first unreferenced disk buffer
	ZF set if not found
Note:	in DOS 5+, this has become essentially a NOP, invoking the same code
	  used by AX=1224h (SHARING DELAY)
SeeAlso: AX=120Eh

INT 2F U - DOS 3.0+ internal - NORMALIZE ASCIZ FILENAME
	AX = 1211h
	DS:SI -> ASCIZ filename to normalize
	ES:DI -> buffer for normalized filename
Return: destination buffer filled with uppercase filename, with slashes turned
	to backslashes
SeeAlso: AX=121Eh,AX=1221h

INT 2F U - DOS 3.0+ internal - GET LENGTH OF ASCIZ STRING
	AX = 1212h
	ES:DI -> ASCIZ string
Return: CX = length of string
SeeAlso: AX=1225h

INT 2F U - DOS 3.0+ internal - UPPERCASE CHARACTER
	AX = 1213h
	STACK: WORD character to convert to uppercase
Return: AL = uppercase character
	STACK unchanged

INT 2F U - DOS 3.0+ internal - COMPARE FAR POINTERS
	AX = 1214h
	DS:SI = first pointer
	ES:DI = second pointer
Return: ZF set if pointers are equal, ZF clear if not equal
	CF clear if pointers equal, CF set if not

INT 2F U - DOS 3.0+ internal - FLUSH BUFFER
	AX = 1215h
	DS:DI -> disk buffer
	SS = DOS DS (must be using a DOS internal stack)
	STACK: WORD drives for which to skip buffer
		ignore buffer if drive same as high byte, or bytes differ and
		  the buffer is for a drive OTHER than that given in low byte
Return: STACK unchanged
Note:	can be called only from within DOS
SeeAlso: AX=1209h

INT 2F U - DOS 3.0+ internal - GET ADDRESS OF SYSTEM FILE TABLE ENTRY
	AX = 1216h
	BX = system file table entry number
Return: CF clear if successful
	    ES:DI -> system file table entry
	    BX = relative entry number in system file table containing entry
	    AX destroyed
	CF set if BX greater than FILES=
Note:	supported by DR DOS 5+
SeeAlso: AX=1220h

INT 2F U - DOS 3.0+ internal - GET CURRENT DIRECTORY STRUCTURE FOR DRIVE
	AX = 1217h
	SS = DOS DS (must be using a DOS internal stack)
	STACK: WORD drive (0 = A:, 1 = B:, etc)
Return: CF set on error
	    (drive > LASTDRIVE)
	CF clear if successful
	    DS:SI -> current directory structure for specified drive
	STACK unchanged
SeeAlso: AX=1219h

INT 2F U - DOS 3.0+ internal - GET CALLER'S REGISTERS
	AX = 1218h
Return: DS:SI -> saved caller's AX,BX,CX,DX,SI,DI,BP,DS,ES (on stack)
Note:	only valid while within DOS

INT 2F U - DOS 3.0+ internal - SET DRIVE???
	AX = 1219h
	SS = DOS DS (must be using a DOS internal stack)
	STACK: WORD drive (0 = default, 1 = A:, etc)
Return: ???
	STACK unchanged
Notes:	calls AX=1217h
	builds a current directory structure if inside server call
	  (INT 21/AX=5D00h)
SeeAlso: AX=1217h,AX=121Fh

INT 2F U - DOS 3.0+ internal - GET FILE'S DRIVE
	AX = 121Ah
	DS:SI -> filename
Return: AL = drive (0 = default, 1 = A:, etc, FFh = invalid)
	DS:SI -> filename without leading X: (if present)
SeeAlso: INT 21/AH=19h,INT 21/AH=60h

INT 2F U - DOS 3.0+ internal - SET YEAR/LENGTH OF FEBRUARY
	AX = 121Bh
	CL = year - 1980
Return: AL = number of days in February
Note:	requires DS to be set to the DOS data segment
SeeAlso: INT 21/AH=2Bh"DATE"

INT 2F U - DOS 3.0+ internal - CHECKSUM MEMORY
	AX = 121Ch
	DS:SI -> start of memory to checksum
	CX = number of bytes
	DX = initial checksum
	SS = DOS DS (must be using a DOS internal stack)
Return: AX, CX destroyed
	DX = checksum
	DS:SI -> first byte after checksummed range
Notes:	used by DOS to determine day count since 1980/1/1 given a date
	supported by DR DOS 5.0+
SeeAlso: AX=121Dh

INT 2F U - DOS 3.0+ internal - SUM MEMORY
	AX = 121Dh
	DS:SI -> memory to add up
	CX = 0000h
	DX = limit
Return: AL = byte which exceeded limit
	CX = number of bytes before limit exceeded
	DX = remainder after adding first CX bytes
	DS:SI -> byte beyond the one which exceeded the limit
Notes:	used by DOS to determine year or month given day count since 1980/1/1
	supported by DR DOS 5.0+
SeeAlso: AX=121Ch

INT 2F U - DOS 3.0+ internal - COMPARE FILENAMES
	AX = 121Eh
	DS:SI -> first ASCIZ filename
	ES:DI -> second ASCIZ filename
Return: ZF set if filenames equivalent, ZF clear if not
Note:	supported by DR DOS 5.0+
SeeAlso: AX=1211h,AX=1221h

INT 2F U - DOS 3.0+ internal - BUILD CURRENT DIRECTORY STRUCTURE
	AX = 121Fh
	SS = DOS DS (must be using a DOS internal stack)
	STACK: WORD drive letter
Return: ES:DI -> current directory structure (will be overwritten by next call)
	STACK unchanged

INT 2F U - DOS 3.0+ internal - GET JOB FILE TABLE ENTRY
	AX = 1220h
	BX = file handle
Return: CF set on error
	    AL = 6 (invalid file handle)
	CF clear if successful
	    ES:DI -> JFT entry for file handle in current process
Notes:	the byte pointed at by ES:DI contains the number of the SFT for the
	  file handle, or FFh if the handle is not open
	supported by DR DOS 5.0+
SeeAlso: AX=1216h,AX=1229h

INT 2F U - DOS 3.0+ internal - CANONICALIZE FILE NAME
	AX = 1221h
	DS:SI -> file name to be fully qualified
	ES:DI -> 128-byte buffer for resulting canonical file name
	SS = DOS DS (must be using a DOS internal stack)
Return: (see INT 21/AH=60h)
Note:	identical to INT 21/AH=60h
SeeAlso: AX=1123h,INT 21/AH=60h

INT 2F U - DOS 3.0+ internal - SET EXTENDED ERROR INFO
	AX = 1222h
	SS = DOS data segment
	SS:SI -> 4-byte records
		BYTE	error code, FFh = last record
		BYTE	error class, FFh = don't change
		BYTE	suggested action, FFh = don't change
		BYTE	error locus, FFh = don't change
	SDA error code set
Return: SI destroyed
	SDA error class, error locus, and suggested action fields set
Note:	can be called only from within DOS
SeeAlso: AX=122Dh,INT 21/AH=59h/BX=0000h,INT 21/AX=5D0Ah

INT 2F U - DOS 3.0+ internal - CHECK IF CHARACTER DEVICE
	AX = 1223h
	DS = DOS DS
	SS = DOS DS (must be using a DOS internal stack)
	SDA+218h (DOS 3.10-3.30) = eight-character blank-padded name
	SDA+22Bh (DOS 4.0-6.0) = eight-character blank-padded name
	SDA file attribute field set
	direction flag clear (i.e. CLD)
Return: CF set if no character device by that name found
	CF clear if found
	    BH bits 4-0 copied from low byte of device attribute word
	    BH bit 5 set, bits 7-6 clear
Notes:	can only be called from within DOS
	the check is skipped (always says "not device") if the volume ID bit
	  of the file attribute field is set on entry
SeeAlso: INT 21/AX=5D06h,INT 21/AX=5D0Bh

INT 2F U - DOS 3.0+ internal - SHARING RETRY DELAY
	AX = 1224h
	SS = DOS DS (must be using a DOS internal stack)
Return: after delay set by INT 21/AX=440Bh, unless in server call
	  (INT 21/AX=5D00h)
Note:	delay is dependent on the processor speed, and is skipped entirely if
	  inside a server call
SeeAlso: INT 21/AX=440Bh,INT 21/AH=52h,INT 62/AX=0097h

INT 2F U - DOS 3.0+ internal - GET LENGTH OF ASCIZ STRING
	AX = 1225h
	DS:SI -> ASCIZ string
Return: CX = length of string
Note:	supported by DR DOS 5.0+
SeeAlso: AX=1212h

INT 2F U - DOS 3.3+ internal - OPEN FILE
	AX = 1226h
	CL = access mode
	DS:DX -> ASCIZ filename
	SS = DOS DS (must be using a DOS internal stack)
Return: CF set on error
	    AL = error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    AX = file handle
Notes:	can only be called from within DOS
	equivalent to INT 21/AH=3Dh
	used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1227h,INT 21/AH=3Dh

INT 2F U - DOS 3.3+ internal - CLOSE FILE
	AX = 1227h
	BX = file handle
	SS = DOS DS (must be using a DOS internal stack)
Return: CF set on error
	    AL = 06h invalid file handle
	CF clear if successful
Notes:	can only be called from within DOS
	equivalent to INT 21/AH=3Eh
	used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1106h,AX=1201h,AX=1226h,INT 21/AH=3Eh

INT 2F U - DOS 3.3+ internal - MOVE FILE POINTER
	AX = 1228h
	BP = 4200h, 4201h, 4202h (see INT 21/AH=42h)
	BX = file handle
	CX:DX = offset in bytes
	SS = DOS DS (must be using a DOS internal stack)
Return: as for INT 21/AH=42h
Notes:	equivalent to INT 21/AH=42h, but may only be called from inside a DOS
	  function call
	sets user stack frame pointer to dummy buffer, moves BP to AX, performs
	  LSEEK, and restores frame pointer
	used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: INT 21/AH=42h

INT 2F U - DOS 3.3+ internal - READ FROM FILE
	AX = 1229h
	BX = file handle
	CX = number of bytes to read
	DS:DX -> buffer
	SS = DOS DS (must be using a DOS internal stack)
Return: as for INT 21/AH=3Fh"DOS"
Notes:	equivalent to INT 21/AH=3Fh, but may only be called when already inside
	  a DOS function call
	used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1226h,INT 21/AH=3Fh"DOS"

INT 2F U - DOS 3.3+ internal - SET FASTOPEN ENTRY POINT
	AX = 122Ah
	BX = entry point to set (0001h or 0002h)
	DS:SI -> FASTOPEN entry point (see #02611,#02612)
		(entry point not set if SI = FFFFh for DOS 4.0+)
Return: CF set if specified entry point already set
Notes:	entry point in BX is ignored under DOS 3.30
	both entry points set to same handler by DOS 4.01
	DOS 5.0 and 6.0 only set entry point 1

(Table 02611)
Values DOS 3.30+ FASTOPEN entry point is called with:
	AL = 01h  Lookup
	    CX = ??? seems to be offset
	    DI = ??? seems to be offset
	    SI = offset in DOS DS of filename
	AL = 02h  insert file into FASTOPEN cache
	AL = 03h  delete file from FASTOPEN cache
	    SI = offset in DOS DS of filename
	AL = 04h  purge FASTOPEN cache
	    AH = subfunction (00h,01h,02h)
	    ES:DI -> ???
	    CX = ??? (subfunctions 01h and 02h only)
Returns: CF set on error or not installed
Note: function 03h calls function 01h first
SeeAlso: #02612,#02613

(Table 02612)
Values PC-DOS 4.01 FASTOPEN is additionally called with:
	AL = 04h ???
	    AH = 03h
	    ???
	AL = 05h ???
	AL = 0Bh ???
	AL = 0Ch ???
	AL = 0Dh ???
	AL = 0Eh ???
	AL = 0Fh ???
	AL = 10h ???
SeeAlso: #02611,#02613

(Table 02613)
Values MS-DOS 5.0-6.0 FASTOPEN is additionally called with:
	AL = 04h  purge FASTOPEN cache
	    AH = 03h
	    ???
	AL = 05h ???
	    DL = drive (00h = A:)
	    ???
	AL = 06h ???
	    ???
SeeAlso: #02611,#02612

INT 2F U - DOS 3.3+ internal - IOCTL
	AX = 122Bh
	BP = 44xxh
	SS = DOS DS (must be using a DOS internal stack)
	additional registers as appropriate for INT 21/AX=44xxh
Return: as for INT 21/AH=44h
Notes:	equivalent to INT 21/AH=44h, but may only be called when already inside
	  a DOS function call
	sets user stack frame pointer to dummy buffer, moves BP to AX, performs
	  IOCTL, and restores frame pointer
	used by NLSFUNC in accessing COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: INT 21/AH=44h

INT 2F U - DOS 3.3+ internal - GET DEVICE CHAIN
	AX = 122Ch
Return: BX:AX -> header of second device driver (NUL is first) in driver chain
Note:	although this function exists in DR DOS 5.0 and Novell DOS 7, it
	  always returns 0000h:0000h prior to Novell DOS 7 Update 15
SeeAlso: INT 21/AH=52h

INT 2F U - DOS 3.3+ internal - GET EXTENDED ERROR CODE
	AX = 122Dh
	SS = DOS DS
Return: AX = current extended error code
SeeAlso: AX=1222h,INT 21/AH=59h/BX=0000h

INT 2F U - DOS 4.0+ internal - GET OR SET ERROR TABLE ADDRESSES
	AX = 122Eh
	DL = subfunction
	    00h get standard DOS error table (see #02614)
		Return: ES:DI -> error table
				 (DOS 4: errors 00h-12h,50h-5Bh)
				 (DOS 5: errors 00h-26h,4Fh,51h-59h)
	    01h set standard DOS error table
		ES:DI -> error table
	    02h get parameter error table (errors 00h-0Ah)
		Return: ES:DI -> error table
	    03h set parameter error table
		ES:DI -> error table
	    04h get critical/SHARE error table (errors 13h-2Bh)
		Return: ES:DI -> error table
	    05h set critical/SHARE error table
		ES:DI -> error table
	    06h get ??? error table
		Return: ES:DI -> error table or 0000h:0000h
	    07h set ??? error table
		ES:DI -> error table
	    08h get error message retriever (see #02615)
		Return: ES:DI -> FAR procedure to fetch error message
	    09h set ??? error table
		ES:DI -> error table
Notes:	if the returned segment on a "get" is 0001h, then the offset specifies
	  the offset of the error message table within COMMAND.COM, and the
	  procedure returned by DL=08h should be called
	DOS 5+ COMMAND.COM does not allow setting any of the addresses (calls
	  with DL odd are ignored); they are always returned with segment 0001h
	for DOS 5.0, the standard and critical/SHARE error tables are combined
	  into a single error table
SeeAlso: AX=0500h,INT 21/AH=59h/BX=0000h

Format of DOS 4.x error table:
Offset	Size	Description	(Table 02614)
 00h	BYTE	FFh
 01h  2 BYTEs	04h,00h (DOS version???)
 03h	BYTE	number of error headers following
 04h 2N WORDs	table of all error headers for table
		Offset	Size	Description
		 00h	WORD	error message number
		 02h	WORD	offset of error message from start of header
				error messages are count byte followed by msg
Note:	DOS 5 error tables consist of one word per error number; each word
	  contains either the offset of a counted string or 0000h

(Table 02615)
Call error retrieval function with:
	AX = error number (see #02616)
	DI = offset of error table
Return: ES:DI -> error message (counted string)
Notes:	this function needs to access COMMAND.COM if the messages were not
	  loaded into memory permanently with /MSG; the caller should assume
	  that the returned message will be overwritten by the next call of
	  the function
	supported by DR DOS 5.0

(Table 02616)
Values for parameter errors:
 01h	Too many parameters
 02h	Required Parameter missing
 03h	Invalid switch
 04h	Invalid keyword
 06h	Parameter value not in allowed range
 07h	Parameter value not allowed
 08h	Parameter value not allowed
 09h	Parameter format not correct
 0Ah	Invalid parameter
 0Bh	Invalid parameter combination

INT 2F U - DOS 4.x internal - SET DOS VERSION NUMBER TO RETURN
	AX = 122Fh
	DX = DOS version number (0000h = return true DOS version)
Notes:	not available under DR DOS 5.0 or 6.0, or Novell DOS 7
	supported by FREEVER.COM, a freeware DOS version faking TSR by Matthias
	  Paul
SeeAlso: INT 21/AH=30h,INT 21/AX=3306h,INT 2F/AX=E000h"SETDRVER"

INT 2F U - Windows95 - FIND SFT ENTRY IN INTERNAL FILE TABLES
	AX = 1230h
	ES:DI -> SFT entry
Return: CF clear if SFT found in internal table
	CF set if SFT not in any internal file table
	    AX = 0000h
	    SI:CX = 32-bit starting cluster number for directory
	    DX = directory entry number
	    BX = index into new file system table
Notes:	the new file system table from which the return values are taken is
	  reported to be statically allocated with 20 entries, and used only
	  for FCB calls
	this function is not supported by DR-DOS 7.03 or earlier, by S/DOS 1.0,
	  or by PTS-DOS 6.51
BUG:	Win95-OSR2 is reported to have a bug that can potentially corrupt
	  memory if SFT tables are "arranged poorly"
SeeAlso: AX=1231h,AX=1200h

INT 2F U - Windows95 - SET/CLEAR "REPORT WINDOWS TO DOS PROGRAMS" FLAG
	AX = 1231h
	DL = function
	    00h set byte after "IsWIN386" to 01h
	    01h set "IsWIN386" bit 1
	    02h clear "IsWIN386" bit 1
	    else
		Return:	CF set
			AX = 0001h
Return: CF clear
	AX = 0000h
Note:	this function is not supported by DR-DOS 7.03 or earlier, by S/DOS 1.0,
	  or by PTS-DOS 6.51
BUG:	Windows98 will crash the system if DL>02h on entry due to an off-by-1
	  conditional jump; if the jump were correct, the function would return
	  CF set/AX=0001h as for Windows95
SeeAlso: AX=1230h,AX=1200h

INT 2F U - PTS-DOS - SET MACHINE ID
	AX = 1250h
	???
Return: ???
Note:	This is known to be supported by Paragon Technology Systems PTS-DOS
	  sometime before 6.51, but is known not to be supported by S/DOS 1.0
	  (which derived from PTS-DOS 6.51)
SeeAlso: AX=1251h

INT 2F U - PTS-DOS - GET MACHINE ID
	AX = 1251h
	???
Return: ???
Note:	This is known to be supported by Paragon Technology Systems PTS-DOS
	  sometime before 6.51, but is known not to be supported by S/DOS 1.0
	  (which derived from PTS-DOS 6.51)
SeeAlso: AX=1250h

INT 2F U - PTS-DOS 6.51, S/DOS 1.0+ - SET SFT INCREMENT
	AX = 1252h
	BX = new SFT increment
Return: ???
Note:	This function is known to be supported by Paragon Technology Systems
	  PTS-DOS 6.51 and S/DOS 1.0 and probably was also supported
	  in earlier releases.
SeeAlso: AX=1253h

INT 2F U - PTS-DOS 6.51, S/DOS 1.0+ - GET SFT INCREMENT
	AX = 1253h
Return: BX = current SFT increment
	AX = ???
Note:	This function is known to be supported by Paragon Technology Systems
	  PTS-DOS 6.51 and S/DOS 1.0 and probably was also supported
	  in earlier releases.
SeeAlso: AX=1252h

INT 2F C - PTS-DOS 6.51, S/DOS 1.0+ - "EMPTY" (RESERVED FOR INPUT STRING)
	AX = 1260h
	ES:DI -> string buffer (see getstr)
	DL = extended keystroke code or FFh if ENTER
Return: AX = 0000h (default handler in the kernel)
	CF set if action done, all registers preserved
Notes:	This function is known to be handled by Paragon Technology Systems
	  PTS-DOS 6.51 and S/DOS 1.0, and probably was also handled
	  in earlier releases.
	The default handler in the kernel justs XORs AX,AX and returns.
	This is reserved to be invoked in input string

INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - GET FIRST UMB
	AX = 1261h
Return: AX = address of first UMB or 1 if invalid function.
Note:	This function is known to be supported by Paragon Technology Systems
	  PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
	  in earlier releases.

INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - GET DOS COLOR
	AX = 1262h
Return: AL = current video attribute used by DOS functions
Note:	This function is known to be supported by Paragon Technology Systems
	  PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
	  in earlier releases.
SeeAlso: AX=1263h

INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - SET DOS COLOR
	AX = 1263h
	DL = new video attribute to be used by DOS functions
Return: ???
Note:	This function is known to be supported by Paragon Technology Systems
	  PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
	  in earlier releases.
SeeAlso: AX=1262h

INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - "SYSBELL" - EMIT A BEEP
	AX = 1270h
Return: ???
Note:	This function is known to be supported by Paragon Technology Systems
	  PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
	  in earlier releases.
SeeAlso: AX=1271h

INT 2F C - PTS-DOS, S/DOS - RESERVED FOR BEEP
	AX = 1271h
Return: ???
Note:	According to the Paragon Technology Systems S/DOS 1.0 sources,
	  which derived from PTS-DOS 6.51, this is reserved for a "BEEP"
	  function. However, S/DOS 1.0 does not handle this function by
	  itself.
SeeAlso: AX=1270h

INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - BACKDOOR INTERCEPT INT 2Fh CHAIN
	AX = 12F0h
	CX:DX -> user INT 2F handler
	CF set
Return: CF clear if successful
	    CX:DX -> previous INT 2F handler
	CF set on error
Notes:	This function is known to be supported by Paragon Technology Systems
	  PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
	  in earlier releases.  It is handled from within the kernel's
	  INT 2Fh dispatcher.
	Resident system extensions should call INT 2Fh/12F0h to intercept
	  the INT 2Fh chain. The main idea of this call is to allow them to
	  be moved to the HMA and intercept INT 2Fh without querying A20 state
	  and without interception of the INT2Fh vector. This is why the
	  "Chain2F" variable must be instanced by placing it to the SDA.
	On chain entry of the far procedure, CF must be set.  All registers
	  except for AX, BP, and DS remain unchanged. If a handler cannot
	  process the call, it must set CF and do a far jump to the previous
	  one in the chain in order to indicate an error.  If CF is still set
	  on exit, the call will be ignored.

INT 2F - PTS-DOS, S/DOS - RESERVED
	AX = 12F1h-12FFh
Return: ???
Note:	According to the Paragon Technology Systems S/DOS 1.0 sources,
	  which derived from PTS-DOS 6.51, these functions are reserved for
	  future use. However, S/DOS 1.0 does not make use of them itself.

INT 2F - FreeDOS - FDAK-DDT - INSTALLATION CHECK / STATUS CHECK
	AX = 12FFh
	BL = 00h
Return: AL = DDh if installed
	    BH = state (00h disabled, nonzero enabled)
	    BL = readonly flag (00h writable, nonzero read-only)
Program: FDAK-DDT is the FreeDOS Alternative Kernel Device Drivers Testing
	  release by Yury A. Semenov
SeeAlso: AX=12FFh/BL=07h

INT 2F - FreeDOS - FDAK-DDT - ENABLE FDAK DRIVERS
	AX = 12FFh
	BL = 01h
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=02h

INT 2F - FreeDOS - FDAK-DDT - DISABLE FDAK DRIVERS
	AX = 12FFh
	BL = 02h
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=01h

INT 2F - FreeDOS - FDAK-DDT - SWITCH BLOCK DEVICE TO READ-ONLY
	AX = 12FFh
	BL = 03h
	???
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=04h

INT 2F - FreeDOS - FDAK-DDT - SWITCH BLOCK DEVICE TO READ-WRITE
	AX = 12FFh
	BL = 04h
	???
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=03h

INT 2F - FreeDOS - FDAK-DDT - TURN ACTIVITY INDICATOR ON
	AX = 12FFh
	BL = 05h
Note:	not yet implemented as of January 1996
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=06h

INT 2F - FreeDOS - FDAK-DDT - TURN ACTIVITY INDICATOR OFF
	AX = 12FFh
	BL = 06h
Note:	not yet implemented as of January 1996
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=05h

INT 2F - FreeDOS - FDAK-DDT - UNINSTALL
	AX = 12FFh
	BL = 07h
Return: ES = segment of FDAK memory block
Note:	the caller must free the memory block returned in ES
	  (via INT 21/AH=49h)
SeeAlso: AX=12FFh/BL=00h

INT 2F U - DR DOS 6.0+ IBMBIO.COM - QUERY SIZE OF THE BDOS
	AX = 12FFh
	BX = 0000h
Return: AX = 0000h if supported
	DX = size of the BDOS in paragraphs
	Flags trashed
	ES,CL destroyed (DR PalmDOS)
Note:	This API is provided by IBMBIO.COM for the initialization phase
	  of drivers loaded via DEVICE=/HIDEVICE=/DEVICEHIGH= directives and
	  is only available during these short time intervals.  It is called
	  by DR DOS 6.0 EMM386.SYS and Novell DOS 7+ EMM386.EXE to query the
	  size of the BDOS kernel (the resident code of IBMDOS.COM).
SeeAlso: AX=12FFh/BX=0001h,AX=12FFh/BX=0002h

INT 2F U - DR DOS 6.0+ IBMBIO.COM - RELOCATE THE BDOS
	AX = 12FFh
	BX = 0001h
	CX = 0000h (DR PalmDOS)
	DX = segment to relocate to (FFFFh for HMA)
Return: AX = 0000h if supported
	Flags trashed
	BX,CX,DX,DI,SI,DS,ES destroyed (DR PalmDOS)
Notes:	This API is provided by IBMBIO.COM for the initialization phase
	  of drivers loaded via DEVICE=/HIDEVICE=/DEVICEHIGH= directives and
	  is only available during these short time intervals.  It is initiated
	  by DR DOS 6.0 EMM386.SYS and Novell DOS 7+ EMM386.EXE to relocate
	  the BDOS kernel (e.g. into the HMA).
	This call is also issued by DR PalmDOS IBMBIO.COM which explicitly
	  clears CX.
	Under Novell DOS 7+ the actual relocation takes place at a later
	  stage, but under DR PalmDOS the BDOS is relocated immediately.
SeeAlso: AX=12FFh/BX=0000h,AX=12FFh/BX=0003h

INT 2F U - DR DOS 6.0+ IBMBIO.COM - QUERY SIZE OF THE BIOS
	AX = 12FFh
	BX = 0002h
Return: AX = 0000h if supported
	DX = size of the DOS BIOS in paragraphs
	CL and flags trashed
Note:	This API is provided by IBMBIO.COM for the initialization phase
	  of drivers loaded via DEVICE=/HIDEVICE=/DEVICEHIGH= directives and
	  is only available during these short time intervals. It is called
	  by DR DOS 6.0 EMM386.SYS and Novell DOS 7 EMM386.EXE to query the
	  size of the DOS BIOS (the resident code of IBMBIO.COM).
SeeAlso: AX=12FFh/BX=0000h,AX=12FFh/BX=0003h

INT 2F U - DR DOS 6.0+ IBMBIO.COM - RELOCATE THE BIOS
	AX = 12FFh
	BX = 0003h
	CX = 0000h (DR PalmDOS)
	DX = segment to relocate to (FFFFh for HMA)
Return: AX = 0000h if supported
	Flags trashed
Notes:	This API is provided by IBMBIO.COM for the initialization phase
	  is only available during these short time intervals.  It is initiated
	  by DR DOS 6.0 EMM386.SYS and Novell DOS 7 EMM386.EXE to relocate the
	  resident part of the DOS BIOS.  The actual relocation takes place at
	  a later stage.
	This call is also issued by DR PalmDOS IBMBIO.COM which explicitly
	  clears CX.
SeeAlso: AX=12FFh/BX=0001h,AX=12FFh/BX=0002h

INT 2F U - DR DOS 6.0+ - BOOT PHASE BROADCASTS FOR MEMORYMAX/RPLOADER/SECURITY
	AX = 12FFh
	BX = 0005h
	CX = 0000h
	DX = function
	    0000h MemoryMAX cleanup broadcast
	    0001h RPLOADER broadcast
	    !!! details to follow
Note:	called at three separate points inside IBMBIO.COM

INT 2F U - DR DOS 6+, Novell DOS 7+ - EMM386.EXE - VIDEO MEMORY SPACE CONTROL
	AX = 12FFh
	BX = 0006h
	DX = 0000h
	CX = function
	    0000h get status of video memory space (MEMMAX /V)
	    0001h map memory into video memory space (MEMMAX +V)
	    0002h unmap memory from video memory space (MEMMAX -V)
Return: CF clear if successful
	    AX = 0000h (successful)
	    BX = segment of reserved video RAM
	    CX = segment of used video RAM
	    DX = segment of first upper MCB
Notes:	this functionality is provided by EMM386, and partially supported by
	  HIDOS.SYS
	BL specifies which program handles the call, BH is the function number
BUG:	4DOS 5.51(a) often hangs the system (reported to be reproducable), if
	  MEMMAX +V is issued from the 4DOS prompt.  To avoid this, one should
	  temporary load COMMAND.COM followed by MEMMAX +v , starting the
	  application, MEMMAX -v and EXIT.  4DOS 5.5c does not show this
	  phenomena on the same systems where 5.51a hangs.
SeeAlso: AX=D201h/BX=4849h

(Table 04105)
Values for DR DOS memory space control error code:
 00h	successful
 80h	video memory already unmapped
 81h	video memory already mapped
 82h	no video memory reserved (/VIDEO not specified)
 83h	video memory in use (graphics mode or non-standard text mode)
 84h	mapped video memory contains allocated arena(s)
 85h	hardware error
 86h	driver requires protected mode but is permanently in real mode
	  ("EMM386 OFF")

INT 2F U - Novell DOS 7 - SCRIPT.EXE - GET ???
	AX = 12FFh
	BX = 0007h
	CX = 0000h
Return: CF clear if installed
	    AX = 0000h
	    BX = ??? (4426h)
	    CX = ??? (0068h)
	    DX = PSP segment of resident code???
	    SI = ??? (4AFAh)
	    ES = resident code segment

INT 2F - DR DOS 6.0+ IBMBIO.COM - REGISTER ROOT OF UPPER MEMORY LINK
	AX = 12FFh
	BX = 0009h
	DX = new value for root segment of upper memory link
Return: AX = 0000h if supported
	ES:BX modified
Notes:	the DX value is stored at offset 66h in SYSVARS (see INT 21h/AH=52h)
	  and offset 18h in the Novell DOS 7 internal variable table
	  (see INT 21/AX=4458h)
	This API is provided by IBMBIO.COM for the initialization phase
	  of drivers loaded via DEVICE=/HIDEVICE=/DEVICEHIGH= directives and
	  is only available during these short time intervals.  It is probably
	  initiated by the Novell DOS 7+ EMM386.EXE.
	this function has apparently been supported since DR DOS 6.0 "Buxton"
	  of 1991/03/19
	for Novell DOS 7, ES:BX points at the internal variable table DRDAT,
	  but this may change in future releases

INT 2F U - Novell DOS 7+ - MEMORYMAX INSTALLATION CHECK
	AX = 12FFh
	BX = 0106h
Return: CF clear if successful
	    AX = 0000h (successful)
	    BX = EDC0h (signature "European Development Centre")
	    CL = memory manager variant
		00h if HIMEM.SYS present
		01h if EMMXMA.SYS present
		02h if EMM386.EXE present (DPMI/VCPI disabled)
		03h if multitasking EMM386.EXE present (DPMI/VCPI loaded)
	    CH = ??? (00h)
	    DX = binary driver version, DH is major, DL is minor
	    ES = segment of EMM386 device driver header (low-memory stub)
	CF set on error
	    AX = 0001h
Notes:	BL specifies which program handles the call, BH is the function number
	if the word at ES:0012h is nonzero, if contains the offset within
	  segment ES of the CEMM-compatible entry point (see #02617)
	if no other program has hooked INT 67, an alternate installation
	  check is to test for the string
	  "NOVELL EXPANDED MEMORY MANAGER 386" at offset 14h in the INT 67
	  handler's segment; the word immediately preceding this string
	  contains the offset of the API entry point if it is nonzero
Index:	entry point;Novell EMM386

(Table 02617)
Call Novell EMM386.EXE entry point with:
	AH = 00h get memory manager's status???
	    ???
	AH = 01h set memory manager's status???
	    ???
	AH = 02h Weitek coprocessor support???
	    AL = subfunction???
	more functions???
SeeAlso: #01513 at INT 21/AX=4402h/SF=02h,#03666 at INT 67/AX=FFA5h

INT 2F - Novell DOS 7+ - MEMORYMAX GET PAGE TABLE ENTRY
	AX = 12FFh
	BX = 0206h
	ESI = linear address
Return: CF clear if successful
	    AX = 0000h (successful)
	    CX = 0000h
	    EDI = page table entry
	CF set on error
	    AX = function status
		0000h function supported
		    CX error code
		       80h if linear address has no mapping
	        0001h (AX > 0) function not supported
		    CX undefined
Note:	This function is supported by Novell DOS 7+ EMM386.EXE 3.0+ and
	  possibly by HIMEM.SYS 2.3+.
SeeAlso: AX=12FFh/BX=0306h

INT 2F - Novell DOS 7+ - MEMORYMAX SET PAGE TABLE ENTRY
	AX = 12FFh
	BX = 0306h
	ESI = linear address
	EDI = page table entry
Return: CF clear if successful
	    AX = 0000h (successful)
	    CX = 0000h
	CF set on error
	    AX = function status
		0000h function supported
		    CX error code
		       80h if linear address has no mapping
	        0001h (AX > 0) function not supported
		    CX undefined
Note:	This function is supported by Novell DOS 7+ EMM386.EXE 3.0+ and
	  possibly by HIMEM.SYS 2.3+.
SeeAlso: AX=12FFh/BX=0206h

INT 2F - Novell DOS 7+ - MEMORYMAX CREATE ACCESS KEY
	AX = 12FFh
	BX = 0406h
Return: CF clear if successful
	    AX = 0000h (successful)
	    CX = 0000h
	    SI:DI = access key
	CF set on error
	    AX = function status
		0000h function supported
		    CX error code
		       80h if access key already exists
	        0001h (AX > 0) function not supported
		    CX undefined
Note:	This function is supported by Novell DOS 7+ EMM386.EXE 3.0+ and
	  possibly by HIMEM.SYS 2.3+.
SeeAlso: AX=12FFh/BX=0506h

INT 2F - Novell DOS 7+ - MEMORYMAX DESTROY ACCESS KEY
	AX = 12FFh
	BX = 0506h
	SI:DI = access key
Return: CF clear if successful
	    AX = 0000h (successful)
	    CX = 0000h
	CF set on error
	    AX = function status
		0000h function supported
		    CX error code
		       80h if invalid access key
		       81h if no access key exists
	        0001h (AX > 0) function not supported
		    CX undefined
Note:	This function is supported by Novell DOS 7+ EMM386.EXE 3.0+ and
	  possibly by HIMEM.SYS 2.3+.
SeeAlso: AX=12FFh/BX=0406h

INT 2F U - Novell DOS 7 - EMM386.EXE - ???
	AX = 12FFh
	BL = 06h
	BH = function (06h-09h)
	???
Return: CF clear if successful
	CF set on error
	    AX = function status
		0000h function supported
		    CX error code
	        0001h (AX > 0) function not supported
		    CX undefined

INT 2F U - Novell DOS 7 - EMM386.EXE - CHECK IF MULTITASKING SUPPORT LOADED???
	AX = 12FFh
	BX = 0EDCh ('EDC' = Novell European Development Center)
Return: AX = 0000h if ??? loaded
	    CF clear
	    BX = 0000h
Notes:	called by Novell DOS 7 TaskMgr
	if this function returns with AX=0000h, then the code necessary to
	  support the API on INT 2F/AX=2780h is loaded and that API becomes
	  available for use
	because the request is handled on the initial trap to the memory
	  manager caused by INT instructions, this function must be invoked
	  with an actual INT 2F instruction instead of some simulation such
	  as a far call to the address in the interrupt vector table
SeeAlso: AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h,AX=2780h/CL=04h

INT 2F U - DOS 3.2+ - SET DISK INTERRUPT HANDLER
	AH = 13h
	DS:DX -> interrupt handler disk driver calls on read/write
	ES:BX = address to restore INT 13 to on system halt (exit from root
		 shell) or warm boot (INT 19)
Return: DS:DX set by previous invocation of this function
	ES:BX set by previous invocation of this function
Notes:	IO.SYS hooks INT 13 and inserts one or more filters ahead of the
	  original INT 13 handler.  The first is for disk change detection
	  on floppy drives, the second is for tracking formatting calls and
	  correcting DMA boundary errors, the third is for working around
	  problems in a particular version of IBM's ROM BIOS
	before the first call, ES:BX points at the original BIOS INT 13; DS:DX
	  also points there unless IO.SYS has installed a special filter for
	  hard disk reads (on systems with model byte FCh and BIOS date
	  "01/10/84" only), in which case it points at the special filter
	most DOS 3.2+ disk access is via the vector in DS:DX, although a few
	  functions are still invoked via an INT 13 instruction
	during Windows 3.1 startup this function seems to be used to
	  temporarily point DOS to a dummy handler in WDCTRL.386 which always
	  halts the system with a fatal error message.	If DS hasn't changed
	  on return from the function, Windows will display the error message
	  "Invalid DOS version".
	this is a dangerous security loophole for any virus-monitoring software
	  which does not trap this call ("INT13", "Nomenklatura", and many
	  Bulgarian viruses are known to use it to get the original ROM entry
	  point)
	the preloadable Novell DOS 7+ SECURITY.BIN driver $SECURE$ traps
	  this call.
BUG:	Novell DOS 7 IBMBIO.COM before 1995-05-08 trashed AX on return from
	  this function. VGACOPY by Thomas M”nkemeier's VGA Software GmbH
	  crashed due to this.	Later releases of Novell DOS 7 preserved the
	  contents of the AX register.
SeeAlso: INT 13/AH=01h,INT 19,INT 9D"VIRUS"

INT 2F U - MS-NET - ???
	AH = 13h
	???
Return: ???
Note:	supposedly used to move (or control the movement of) NCBs

INT 2F C - NLSFUNC.COM - INSTALLATION CHECK
	AX = 1400h
	BX <> 0EDCh
Return: AL = status
	    00h not installed, OK to install
	    01h not installed, not OK to install
	    FFh installed
Notes:	this function is called by the DOS v3.3+ kernel
	supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh
	supported by DR DOS 5.0+ NLSFUNC v3.0+
	documented for MS-DOS 5+, but undocumented in prior versions
	DR DOS 5.0+ NLSFUNC 3.00+ returns CF set and AX=0001h, if AL was not
	  00h, FEh, or FFh on entry.
SeeAlso: AX=1400h/BX=0EDCh,AX=1401h"NLSFUNC",AX=1402h"NLSFUNC"

INT 2Fh - DR-DOS NLSFUNC 4.01+ - ENHANCED INSTALLATION CHECK
	AX = 1400h
	BX = 0EDCh
Return: AL = status
	    00h not installed, OK to install
	    01h not installed, not OK to install
		  (for example under a multitasker)
	    FFh installed
		ES:DI -> version signature ("4.01$".."4.04$" for 4.01..4.04)
	flags may be destroyed
Program: NLSFUNC 4.01+ is currently an independent project under
	  development by Matthias Paul. It is not yet publically available,
	  but as NLSFUNC 4.00 did, it will probably become available with
	  future DR-DOS releases.
Notes:	If BX <> 0EDCh on entry, DR-DOS NLSFUNC 4.01+ performs the standard
	  installation check (INT 2F/AX=1400h), and does not change ES:DI.
	DR DOS 5.0+ NLSFUNC 3.00+ returns CF set and AX=0001h, if AL was not
	  00h, FEh, or FFh on entry.
	NLSFUNC 4.01+ will use the ES:DI enhancement to check the driver
	  version and calculate displacements into the resident driver for
	  runtime updates of internal structures like the local NLS database
	  filespec, etc.
	If the returned ES points into the HMA (ES=FFFEh) care should be taken
	  to actually access the HMA while checking the version signature and
	  updating resident data (mutex with local A20 enable/disable).
	While previous issues of NLSFUNC installed under a multitasker,
	  DR-DOS NLSFUNC 4.01+ will actually adapt to work properly in this
	  environment.
SeeAlso: AX=1400h"NLSFUNC.COM",AX=14FEh,AX=14FFh,INT 21/AH=65h

INT 2F - European MS-DOS 4.0 POPUP - "CheckPu" - INSTALLATION CHECK
	AX = 1400h
Return: AX = FFFFh if installed
	    BX = maximum memory required to save screen and keyboard info
	CF clear if successful
	CF set on error
	    AX = error code
		0002h invalid function
		0004h unknown error
Note:	the POPUP interface is used by background programs (see INT 21/AH=80h)
	  to communicate with the user
SeeAlso: AX=1401h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP"

INT 2F CU - NLSFUNC.COM - CHANGE CODE PAGE
	AX = 1401h
	DS:SI -> internal code page structure (see #02618)
	BX = new code page (see #01757 at INT 21/AX=6602h)
	DX = country code???
Return: AL = status
	     00h successful
	     else DOS error code
Note:	this function is called by the DOS v3.3+ kernel
SeeAlso: AX=1400h"NLSFUNC",AX=1402h"NLSFUNC",INT 21/AH=66h

Format of DOS 3.30 internal code page structure:
Offset	Size	Description	(Table 02618)
 00h  8 BYTEs	???
 08h 64 BYTEs	name of country information file (see #02619)
 48h	WORD	system code page (see #01757 at INT 21/AX=6602h)
 4Ah	WORD	number of supported subfunctions
 4Ch  5 BYTEs	data to return for INT 21/AX=6502h
 51h  5 BYTEs	data to return for INT 21/AX=6504h
 56h  5 BYTEs	data to return for INT 21/AX=6505h
 5Bh  5 BYTEs	data to return for INT 21/AX=6506h
 60h 41 BYTEs	data to return for INT 21/AX=6501h

Format of MS-DOS/PC-DOS/OS2/WinNT/PTS-DOS COUNTRY.SYS file:
Offset	Size	Description	(Table 02619)
 00h	BYTE	ID tag (FFh)
 01h  7 BYTEs	ASCII "COUNTRY"
 08h  8 BYTEs	??? (00h)
 10h	BYTE	??? (01h)
 11h	BYTE	??? (00h)
 12h	BYTE	??? (01h)
 13h	DWORD	offset of first entry in file (see #02620)
SeeAlso: #02623

Format of MS-DOS/PC-DOS/OS2/WinNT/PTS-DOS COUNTRY.SYS entry:
Offset	Size	Description	(Table 02620)
 00h	WORD	number of country-codepage entries following
 02h		N Country-Codepage entries:
		Offset	Size	Description
		 00h	WORD	length of entry, not counting this word (000Ch)
		 02h	WORD	country ID
		 04h	WORD	codepage ID
		 06h	WORD	??? (0000h)
		 08h	WORD	??? (0000h)
		 0Ah	DWORD	offset of country-subfunction-header in file
				  (see #02621)
Notes:	multiple codepages for a country are stored consecutively
	PTS/DOS places a copyright string immediately following this structure,
	  though a copyright at the end of the file is preferable
SeeAlso: #02619

Format of MS-DOS/PC-DOS/OS2/WinNT/PTS-DOS COUNTRY.SYS country-subfunc header:
Offset	Size	Description	(Table 02621)
 00h	WORD	number of subfunction entries following
 02h		N subfunction entries
		Offset	Size	Description
		 00h	WORD	length of subfunction entry, not counting this
				  word (usually 06h)
		 02h	WORD	subfunction ID
				(value passed to INT 21/AH=65h in AL)
		 04h	DWORD	offset within file of subfunction data entry
				  (see #02622)
SeeAlso: #02620

Format of MS-DOS/PC-DOS/OS2/WinNT/PTS-DOS COUNTRY.SYS country-subfunc data::
Offset	Size	Description	(Table 02622)
 00h	BYTE	ID-tag (FFh)
 01h  7 BYTEs	table-type signature (blank-padded)
		"CTYINFO"	general country info (subfn 01h)
		"UCASE	"	uppercase table (subfn 02h)
		"LCASE	"	lowercase table (subfn 03h) (DOS 6.2_)
		"FUCASE "	filename uppercase table (subfn 04h)
		"FCHAR	"	filename terminator table (subfn 05h)
		"COLLATE"	collating sequence (subfn 06h)
		"DBCS	"	double-byte character table (subfn 07h)
 08h	WORD	length of following table in bytes
		(if 0000h for DBCS table, there will still be a word of 0000h)
---country info (01h)---
 0Ah	WORD	country ID (see #01400 at AH=38h)
 0Ch	WORD	code page (see #01757)
 0Eh 34 BYTEs	country-dependent info (see #01399 at AH=38h)
---uppercase table (02h)---
 0Ah 128 BYTEs	uppercase equivalents (if any) of chars 80h to FFh
---lowercase table (03h)---
 0Ah 256 BYTEs	lowercase equivalents (if any) of chars 00h to FFh
---filename uppercase table (04h)---
 0Ah 128 BYTEs	uppercase equivalents (if any) of chars 80h to FFh
---filename terminator table (05h)---
 0Ah	BYTE	??? (01h for MS-DOS 3.30-6.00)
 0Bh	BYTE	lowest permissible character value for filename
 0Ch	BYTE	highest permissible character value for filename
 0Dh	BYTE	??? (00h for MS-DOS 3.30-6.00)
 0Eh	BYTE	first excluded character in range \ all characters in this
 0Fh	BYTE	last excluded character in range  / range are illegal
 10h	BYTE	??? (02h for MS-DOS 3.30-6.00)
 11h	BYTE	number of illegal (terminator) characters
 12h  N BYTEs	characters which terminate a filename:	."/\[]:|<>+=;,
---collating sequence (06h)---
 0Ah 256 BYTEs	values used to sort characters 00h to FFh
---DBCS table (07h)---
 0Ah 2N BYTEs	start/end for N lead byte ranges
	WORD	0000h	(end of table)
SeeAlso: #02621,#01750,#01751,#01753,#01754,#01755,#01756

Format of DR DOS/Novell DOS/OpenDOS COUNTRY.SYS file:
Offset	Size	Description	(Table 02623)
 00h 126 BYTEs	copyright notice (terminated with Ctrl-Z; NUL-padded)
		the copyright notice starts with the signature
		"COUNTRY.SYS Rx.xx" where "x.xx" indicates the file format
		revision, which is checked by the OS (revision is 2.00 for
		DR DOS 3.41 and 2.01 for all newer versions of DR DOS,
		Novell DOS, and OpenDOS)
 7Eh	WORD	signature of file format revision
		0EDCh = 2.00 (DR DOS 3.41)
		EDC1h = 2.01 (all newer versions)
 80h	var	country pointer records (see #02624)
		(packed array of variable-size records)
SeeAlso: #02619

Format of DR DOS/Novell DOS/OpenDOS COUNTRY.SYS country pointer record::
Offset	Size	Description	(Table 02624)
 00h	WORD	country code (0000h if end of array)
 02h	WORD	code page (see #01757)
 04h	WORD	??? (0000h)
 06h  7	WORDs	offsets in file for INT 21/AH=65h subfunctions 01h to 07h, or
		  0000h if no table for that subfunction
 14h	var	country information
Notes:	the end-of-file marker is a country pointer record filled entirely with
	  zeros
	the data at which the pointers point is in the same format as the
	  tables returned by INT 21/AH=65h, except that the general-info
	  table for subfunction 01h does not contain the length word at the
	  beginning
SeeAlso: #02623

INT 2F - European MS-DOS 4.0 POPUP - "PostPu" - OPEN/CLOSE POPUP SCREEN
	AX = 1401h
	DL = function (00h open, 01h close)
	DH = wait flag
	    00h block until screen opens
	    01h return error if screen is not available
	    02h urgent--always open screen immediately
Return: CF clear if successful
	    BX = amount of memory needed to save screen and keyboard info,
		0000h if default save location can be used (only if DH was 02h)
	CF set on error
Note:	the application using the screen is frozen until the popup screen is
	  closed
SeeAlso: AX=1400h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP"

INT 2F CU - NLSFUNC.COM - GET EXTENDED COUNTRY INFO
	AX = 1402h
	BP = subfunction (same as AL for INT 21/AH=65h)
	BX = code page (see #01757 at INT 21/AX=6602h)
	DX = country code (see #01400 at INT 21/AH=38h)
	DS:SI -> internal code page structure (see #02618)
	ES:DI -> user buffer
	CX = size of user buffer
Return: AL = status
	    00h successful
	    else DOS error code
Notes:	this function is called by the DOS v3.3+ kernel on INT 21/AH=65h
	code page structure apparently only needed for COUNTRY.SYS pathname
SeeAlso: AX=1401h"NLSFUNC",AX=1403h"NLSFUNC",AX=1404h,INT 21/AH=65h

INT 2F - European MS-DOS 4.0 POPUP - "SavePu" - SAVE POPUP SCREEN
	AX = 1402h
	ES:DI -> save buffer (0000h:0000h for default buffer in POPUP)
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02625)
SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1403h"POPUP"

(Table 02625)
Values for POPUP error code:
 0001h	process does not own screen
 0004h	unknown error
 0005h	invalid pointer

INT 2F CU - NLSFUNC.COM - SET CODE PAGE
	AX = 1403h
	DS:SI -> internal code page structure (see #02618)
	BX = code page (see #01757 at INT 21/AX=6602h)
	DX = country code (see #01400 at INT 21/AH=38h)
Return: AL = status
	     ???
Note:	this function is called by the DOS v3.3+ kernel on INT 21/AH=38h
SeeAlso: AX=1402h"NLSFUNC",AX=1404h,INT 21/AH=38h"SET"

INT 2F - European MS-DOS 4.0 POPUP - "RestorePu" - RESTORE SCREEN
	AX = 1403h
	ES:DI -> buffer containing saved screen
		(0000h:0000h for default buffer in POPUP)
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02625)
SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1402h"POPUP"

INT 2F CU - NLSFUNC.COM - GET COUNTRY INFO
	AX = 1404h
	BX = code page (see #01757 at INT 21/AX=6602h)
	DX = country code (see #01400 at INT 21/AH=38h)
	DS:SI -> internal code page structure (see #02618)
	ES:DI -> user buffer
Return: AL = status
	     ???
Notes:	this function is called by the DOS v3.3+ kernel on INT 21/AH=38h
	code page structure apparently only needed for COUNTRY.SYS pathname
SeeAlso: AX=1402h,AX=1403h,INT 21/AH=38h"GET"

INT 2F U - DR DOS 5.0 NLSFUNC - GET EXTENDED COUNTRY INFORMATION
	AX = 14FEh
	BX = code page (FFFFh=global code page) (see #01757 at INT 21/AX=6602h)
	DX = country ID (FFFFh=current country) (see #01400 at INT 21/AH=38h)
	ES:DI -> country information buffer
	CL = info ID
	    01h get general internationalization info
	    02h get pointer to uppercase table
	    04h get pointer to filename uppercase table
	    05h get pointer to filename terminator table
	    06h get pointer to collating sequence table
	    07h get pointer to Double-Byte Character Set table
	CF set (used to return error if not installed)
Return: CF clear if successful
	    DS:SI -> requested information
	CF set on error
Notes:	DR DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
	  or FFh on entry.
	the DR DOS kernel calls this function on INT 21/AX=6501h
	the value in CL is not range-checked by the DR DOS 5.0 NLSFUNC
SeeAlso: #02626,AX=14FFh,INT 21/AH=65h

Format of DR DOS COUNTRY.SYS file:
Offset	Size	Description	(Table 02626)
 00h 126 BYTEs	copyright notice (terminated with Ctrl-Z, padded with NULs)
 7Eh	WORD	signature EDC1h
 80h	var	country pointer records
	Offset	Size	Description
	 00h	WORD	country code (0000h if end of array)
	 02h	WORD	code page (see #01757 at INT 21/AX=6602h)
	 04h	WORD	??? (0000h)
	 06h  7 WORDs	offsets in file for data tables for subfunctions
			  01h-07h
 var	var	country information

INT 2F U - DR DOS 5.0+ NLSFUNC - PREPARE CODE PAGE
	AX = 14FFh
	BX = code page (see #01757 at INT 21/AX=6602h)
Return: AX = ???
	ZF set if AX=0000h
Notes:	DR DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
	  or FFh on entry.
	passes codepage preparation request to each character device supporting
	  the generic IOCTL call
BUG:	DR DOS 5.0 NLSFUNC 3.00 - Novell DOS 7 NLSFUNC 3.03, and OpenDOS 7.01 -
	  DR-OpenDOS 7.02 NLSFUNC 3.02 requires DF cleared on entry, otherwise
	  the system may crash.  However, since this function is called only by
	  the BDOS, the problem never actually occurs.  DR-DOS 7.02/7.03
	  NLSFUNC 4.00+ always clears DF by itself.
SeeAlso: AX=1400h/BX=0EDCh,AX=14FEh,INT 21/AX=440Ch,INT 21/AX=6602h

INT 2F - DOS 4.00 GRAPHICS.COM - INSTALLATION CHECK
	AX = 1500h
Return: AX = FFFFh
	ES:DI -> ??? (graphics data?)
Note:	this installation check conflicts with the CD-ROM Extensions
	  installation check; moved to AX=AC00h in later versions
SeeAlso: AX=AC00h

INT 2F - CD-ROM - INSTALLATION CHECK
	AX = 1500h
	BX = 0000h
Return: BX = number of CD-ROM drive letters used
	CX = starting drive letter (0=A:)
	AX = 15FFh (Novell DOS 7 NWCDEX only!)
Notes:	this installation check DOES NOT follow the format used by other
	  software
	this installation check conflicts with the DOS 4.00 GRAPHICS.COM
	  installation check
BUG:	this function may return an incorrect starting drive letter when
	  INTERLNK is installed
SeeAlso: AX=150Ch,AX=15FFh,INT 2F/AX=D000h"Lotus"

INT 2F U - CDBLITZ v2.11 - INSTALLATION CHECK
	AX = 1500h
	CH = 90h (function number)
	BX = 1234h (magic value for CDBLITZ)
Return: CX = 1234h if installed
	    CF clear
	    DX = BCD version number (DH = major, DL = minor)
Program: CDBLITZ is a CD-ROM cache by Blitz 'n' Software, Inc.
SeeAlso: AX=1500h/CH=99h

INT 2F U - CDBLITZ v2.11 - GET STATISTICS
	AX = 1500h
	CH = 91h (function number)
	BX = 1234h (magic value for CDBLITZ)
Return: CF clear
	ES:BX -> statistics record (see #02627)
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=97h

Format of CDBLITZ statistics record:
Offset	Size	Description	(Table 02627)
 00h	WORD	cache mode (see also AX=1500h/CH=94h)
		0001h 'min', 0002h 'max'
 02h	DWORD	number of read calls???
 06h	DWORD	total number of sectors read
 0Ah	DWORD	unused??? (zero)
 0Eh	DWORD	number of cache hit sectors
 12h	WORD	cache size in KB
 14h	WORD	unused??? (zero)
 16h	WORD	cache state (0000h disabled, 0001h enabled)

INT 2F U - CDBLITZ v2.11 - ENABLE CACHE
	AX = 1500h
	CH = 92h (function number)
	BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=93h,AX=1500h/CH=94h

INT 2F U - CDBLITZ v2.11 - DISABLE CACHE
	AX = 1500h
	CH = 93h (function number)
	BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=92h,AX=1500h/CH=95h

INT 2F U - CDBLITZ v2.11 - SET 'MAX' MODE (CACHE BOTH DIRECTORIES AND DATA)
	AX = 1500h
	CH = 94h (function number)
	BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=92h,AX=1500h/CH=95h

INT 2F U - CDBLITZ v2.11 - SET 'MIN' MODE (CACHE ONLY DIRECTORY ENTRIES)
	AX = 1500h
	CH = 95h (function number)
	BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=94h

INT 2F U - CDBLITZ v2.11 - FLUSH CACHE
	AX = 1500h
	CH = 96h (function number)
	BX = 1234h (magic value for CDBLITZ)
Return: CF clear
Note:	this function resets the counts for number of sectors read and number
	  of cache hits, but no other values in the statistics record
	  (see #02627)
SeeAlso: AX=1500h/CH=90h

INT 2F U - CDBLITZ v2.11 - GET CACHE STATISTICS
	AX = 1500h
	CH = 97h (function number)
	BX = 1234h (magic value for CDBLITZ)
Return: CF clear
	AL = cache mode (01h 'min', 02h 'max') (see also AX=1500h/CH=94h)
	AH = cache state (00h disabled, 01h enabled)
	BX = cache size in KB
	DX:CX = total number of reads
	DI:SI = number of cache hits
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=91h

INT 2F U - CDBLITZ v2.11 - UNINSTALL
	AX = 1500h
	CH = 99h (function number)
	BX = 1234h (magic value for CDBLITZ)
Return: CF clear
	???
Program: CDBLITZ is a CD-ROM cache by Blitz 'n' Software, Inc.
SeeAlso: AX=1500h/CH=90h

INT 2F - CD-ROM - GET DRIVE DEVICE LIST
	AX = 1501h
	ES:BX -> buffer to hold drive letter list (5 bytes per drive letter)
Return: buffer filled, for each drive letter
	  BYTE	subunit number in driver
	  DWORD address of device driver header (see #01646)
Note:	reportedly returns AX=0000h and an invalid address under Windows95;
	  other reports say it works fine
SeeAlso: AX=1510h

INT 2F - CD-ROM - GET COPYRIGHT FILE NAME
	AX = 1502h
	ES:BX -> 38-byte buffer for name of copyright file
	CX = drive number (0=A:)
Return: CF set if drive is not a CD-ROM drive
	    AX = 000Fh (invalid drive)
	CF clear if successful
SeeAlso: AX=1503h

INT 2F - CD-ROM - GET ABSTRACT FILE NAME
	AX = 1503h
	ES:BX -> 38-byte buffer for name of abstract file
	CX = drive number (0=A:)
Return: CF set if drive is not a CD-ROM drive
	    AX = 000Fh (invalid drive)
	CF clear if successful
SeeAlso: AX=1502h,AX=1504h

INT 2F - CD-ROM - GET BIBLIOGRAPHIC DOC FILE NAME
	AX = 1504h
	ES:BX -> 38-byte buffer for name of bibliographic documentation file
	CX = drive number (0=A:)
Return: CF set if drive is not a CD-ROM drive
	    AX = 000Fh (invalid drive)
	CF clear if successful
SeeAlso: AX=1502h,AX=1503h

INT 2F - CD-ROM - READ VTOC
	AX = 1505h
	ES:BX -> 2048-byte buffer
	CX = drive number (0=A:)
	DX = sector index (0=first volume descriptor,1=second,...)
Return: CF set on error
	    AX = error code (15=invalid drive,21=not ready)
	CF clear if successful
	    AX = volume descriptor type (1=standard,FFh=terminator,0=other)
Note:	This function was not supported by Novell DOS 7 NWCDEX prior to the
	  08/16/94 update

INT 2F - CD-ROM - TURN DEBUGGING ON
	AX = 1506h
	BX = debugging function to enable
Note:	reserved for development
SeeAlso: AX=1507h

INT 2F - CD-ROM - TURN DEBUGGING OFF
	AX = 1507h
	BX = debugging function to disable
Note:	reserved for development
SeeAlso: AX=1506h

INT 2F - CD-ROM - ABSOLUTE DISK READ
	AX = 1508h
	ES:BX -> buffer
	CX = drive number (0=A:)
	SI:DI = starting sector number
	DX = number of sectors to read
Return: CF set on error
	    AL = error code (0Fh invalid drive,15h not ready)
	CF clear if successful
Note:	returns error 15h (not ready) under Windows95 if the starting sector
	  number is less than 10h
SeeAlso: AX=1509h

INT 2F - CD-ROM - ABSOLUTE DISK WRITE
	AX = 1509h
	ES:BX -> buffer
	CX = drive number (0=A:)
	SI:DI = starting sector number
	DX = number of sectors to write
Note:	corresponds to INT 26h and is currently reserved and nonfunctional,
	  but could be implemented for CD-R and CD-RW drives
SeeAlso: AX=1508h

INT 2F - CD-ROM - RESERVED
	AX = 150Ah

INT 2F - CD-ROM v2.00+ - DRIVE CHECK
	AX = 150Bh
	CX = drive number (0=A:)
Return: BX = ADADh if MSCDEX.EXE installed
	    AX = support status
		0000h if drive not supported
		nonzero if supported
SeeAlso: AX=150Dh

INT 2F - CD-ROM v2.00+ - GET MSCDEX.EXE VERSION (GET VERSION)
	AX = 150Ch
	BX = 0000h
Return: BH = major version
	BL = minor version
Notes:	MSCDEX.EXE versions prior to 2.00 leave BX unchanged, thus BX should
	  be 0000h on entry
	Corel's CORELCDX.COM v1.01d returns 2.20, v1.12a returns 2.21
	Meridian Data's CDNETEX.EXE returns its own version number, e.g. 4.70
	J.M.A. Hall's CDEMU2.COM returns 2.10 (it is an MSCDEX emulator for
	  networked CD-ROM drives)
	Windows95 returns v2.95
	Novell DOS 7 NWCDEX.EXE returns the same version number reported in
	  its startup message
SeeAlso: AX=1500h"CD-ROM",AX=15FFh"CORELCDX"

INT 2F - CD-ROM v2.00+ - GET CD-ROM DRIVE LETTERS
	AX = 150Dh
	ES:BX -> buffer for drive letter list (1 byte per drive)
Return: buffer filled with drive numbers (0=A:).  Each byte corresponds
	to the drive in the same position for function 1501h
SeeAlso: AX=150Bh

INT 2F - CD-ROM v2.00+ - GET/SET VOLUME DESCRIPTOR PREFERENCE
	AX = 150Eh
	BX = subfunction
	    00h get preference
		DX = 0000h
		Return: DX = preference settings
	    01h set preference
		DH = volume descriptor preference
		    01h = primary volume descriptor
		    02h = supplementary volume descriptor
		DL = supplementary volume descriptor preference
		    01h = shift-Kanji
	CX = drive number (0=A:)
Return: CF set on error
	    AX = error code (15=invalid drive,1=invalid function)
	CF clear if successful

INT 2F - CD-ROM v2.00+ - GET DIRECTORY ENTRY
	AX = 150Fh
	CL = drive number (0=A:)
	CH bit 0 = copy flag
		clear if direct copy
		set if copy to structure which removes ISO/High Sierra diffs
	ES:BX -> ASCIZ path name
	SI:DI -> buffer for directory entry (see #02628,#02629)
		must be 255 bytes for direct copy, 285 bytes for canonical
Return: CF set on error
	    AX = error code
	CF clear if successful
	    AX = disk format (0=High Sierra,1=ISO 9660)
Note:	this function was not supported by Novell DOS 7 NWCDEX prior to the
	  08/16/94 update

Format of CD-ROM directory entry (direct copy):
Offset	Size	Description	(Table 02628)
 00h	BYTE	length of directory entry
 01h	BYTE	length of XAR in Logical Block Numbers
 02h	DWORD	LBN of data, Intel (little-endian) format
 06h	DWORD	LBN of data, Motorola (big-endian) format
 0Ah	DWORD	length of file, Intel format
 0Eh	DWORD	length of file, Motorola format
---High Sierra---
 12h  6 BYTEs	date and time
 18h	BYTE	bit flags
 19h	BYTE	reserved
---ISO 9660---
 12h  7 BYTEs	date and time
		(seventh byte is offset from GMT in 15-minute increments)
 19h	BYTE	bit flags
---both formats---
 1Ah	BYTE	interleave size
 1Bh	BYTE	interleave skip factor
 1Ch	WORD	volume set sequence number, Intel format
 1Eh	WORD	volume set sequence number, Motorola format
 20h	BYTE	length of file name
 21h  N BYTEs	file name
	BYTE	(optional) padding if filename is odd length
      N BYTEs	system data
SeeAlso: #02629,#01352

Format of CD-ROM directory entry (canonicalized):
Offset	Size	Description	(Table 02629)
 00h	BYTE	length of XAR in Logical Block Numbers
 01h	DWORD	Logical Block Number of file start
 05h	WORD	size of disk in logical blocks
 07h	DWORD	file length in bytes
 0Bh  7 BYTEs	date and time
 12h	BYTE	bit flags
 13h	BYTE	interleave size
 14h	BYTE	interleave skip factor
 15h	WORD	volume set sequence number
 17h	BYTE	length of file name
 18h 38 BYTEs	ASCIZ filename
 3Eh	WORD	file version number
 40h	BYTE	number of bytes of system use data
 41h 220 BYTEs	system use data
SeeAlso: #02628

INT 2F - CD-ROM v2.10+ - SEND DEVICE DRIVER REQUEST
	AX = 1510h
	CX = CD-ROM drive letter (0 = A, 1 = B, etc)
	ES:BX -> CD-ROM device driver request header (see #02597 at AX=0802h)
Return: CF clear if device driver has been called (check the request header's
	      status word to determine whether an error has occurred)
	    ES:BX request header updated
	CF set if device driver has not been called
	    AX = error code (000Fh = invalid drive, 0001h = invalid function)
	    ES:BX request header unchanged
Notes:	MSCDEX initializes the device driver request header's subunit field
	  based on the drive number specified in CX
	MSCDEX v2.21 through v2.25 (at least) return error code AX=0001h if
	  nested calls are attempted
BUGS:	Novell DOS 7 NWCDEX prior to the 12/13/94 update did not initialize
	  the subunit field
	Windows95 sets CF if CX isn't a CD-ROM drive but leaves CF unchanged
	  if the drive is in fact a CD-ROM
SeeAlso: AX=0802h

INT 2F - CD-ROM - CORELCDX - INSTALLATION CHECK
	AX = 15FFh
	BX = 0000h
Return: BX = ABCDh if CORELCDX loaded
Note:	Corel's CORELCDX.COM is a replacement for MSCDEX.EXE; it also supports
	  the standard MSCDEX installation check calls AX=1500h and AX=150Ch
SeeAlso: AX=1500h"CD-ROM",AX=150Ch