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INT 21 - DOS 2+ internal - GET LIST OF LISTS
        Format of memory control block (see also below):
        Format of STARLITE memory control block:
        Format of DOS 4.x data segment subsegment control blocks:
        Format of data at start of STACKS code segment (if present):
        Format of array elements in STACKS data segment:
        SHARE.EXE hooks (DOS 3.1-4.01):
        Format of sharing record:
        Format of SHARE.EXE lock record:
        Format of DOS 2.x system file tables:
        Format of DOS 3.x system file tables and FCB tables:
        Format of DOS 4+ system file tables and FCB tables:
        Format of current directory structure (array, 51h bytes [58h for DOS 4.x] per
        Format of device driver header:
        Format of CLOCK$ transfer record:
        Format of DOS 2.x disk buffer:
        Format of DOS 3.x disk buffer:
        Format of DOS 4.00 (pre UR 25066) disk buffer info:
        Format of DOS 4.01 (from UR 25066 Corrctive Services Disk on) disk buffer info:
        Format of DOS 4.x disk buffer hash chain head (array, one entry per chain):
        Format of DOS 4.x disk buffer:
        Format of IFS driver list:
        Call IFS utility function entry point with:
        Format of IFS request block:
        Format of IFS open file structure:
        Format of one item in DOS 4 list of special program names:
INT 21 - DOS 2+ internal - TRANSLATE BIOS PARAMETER BLOCK
INT 21 - DOS 2+ - GET VERIFY FLAG
INT 21 - DOS 2+ internal - CREATE PSP
INT 21 - DOS 2+ - RENAME A FILE
INT 21 - DOS 2+ - GET FILE'S DATE/TIME
INT 21 - DOS 2+ - SET FILE'S DATE/TIME
INT 21 - DOS 4.0 - GET ???
INT 21 - DOS 4.0 - GET ???
INT 21 - DOS 4.0 - ???
INT 21 - DOS 3+ - GET/SET MEMORY ALLOCATION STRATEGY
INT 21 - DOS 3+ - GET EXTENDED ERROR CODE
INT 21 - DOS 3+ - CREATE UNIQUE FILE
INT 21 - DOS 3+ - CREATE NEW FILE
INT 21 - DOS 3+ - LOCK/UNLOCK FILE ACCESS
INT 21 - DOS 3.1+ internal - SERVER FUNCTION CALL
INT 21 - DOS 3.1+ internal - COMMIT ALL FILES FOR SPECIFIED COMPUTER/PROCESS
INT 21 - DOS 3.1+ internal - SHARE.EXE - CLOSE FILE BY NAME
INT 21 - DOS 3.1+ internal - SHARE.EXE - CLOSE ALL FILES FOR GIVEN COMPUTER
INT 21 - DOS 3.1+ internal - SHARE.EXE - CLOSE ALL FILES FOR GIVEN PROCESS
INT 21 - DOS 3.1+ internal - SHARE.EXE - GET OPEN FILE LIST ENTRY
INT 21 - DOS 3.0+ internal - GET ADDRESS OF DOS SWAPPABLE DATA AREA
INT 21 - DOS 3.1+ network - GET REDIRECTED PRINTER MODE
INT 21 - DOS 3.1+ network - SET REDIRECTED PRINTER MODE
INT 21 - DOS 3.1+ network - FLUSH REDIRECTED PRINTER OUTPUT
INT 21 - DOS 3.1+ internal - SET EXTENDED ERROR INFORMATION
INT 21 - DOS 4.x internal - GET DOS SWAPPABLE DATA AREAS
INT 21 - DOS 3.1 + Microsoft Networks - GET MACHINE NAME
INT 21 - DOS 3.1 + Microsoft Networks - SET MACHINE NAME
INT 21 - DOS 3.1 + Microsoft Networks - SET PRINTER SETUP
INT 21 - DOS 3.1 + Microsoft Networks - GET PRINTER SETUP
INT 21 - DOS 3.1 + Microsoft Networks - SET PRINTER MODE
INT 21 - DOS 3.1 + Microsoft Networks - GET PRINTER MODE
INT 21 - DOS 3.1+ network - GET REDIRECTION MODE
INT 21 - DOS 3.1+ network - SET REDIRECTION MODE
INT 21 - DOS 3.1 + Microsoft Networks, VINES - GET REDIRECTION LIST ENTRY
INT 21 - DOS 3.1 + Microsoft Networks, Banyan VINES - REDIRECT DEVICE
INT 21 - DOS 3.1 + Microsoft Networks, Banyan VINES - CANCEL REDIRECTION
INT 21 - DOS 4.x + Microsoft Networks - GET REDIRECTION LIST EXTENDED ENTRY
INT 21 - STARLITE architecture - MAP LOCAL DRIVE LETTER TO REMOTE FILE SYSTEM
INT 21 - Network - GET REDIRECTION LIST???
INT 21 - STARLITE architecture - UNMAP DRIVE LETTER
INT 21 - STARLITE architecture - MAKE NAMED OBJECT AVAILABLE ON NETWORK
INT 21 - STARLITE architecture - REMOVE GLOBAL NETWORK NAME OF OBJECT
INT 21 - STARLITE architecture - BIND TO NETWORK DEVICE
INT 21 - STARLITE architecture - DETACH FROM NETWORK DEVICE
INT 21 - LANtastic - GET LOGIN ENTRY
INT 21 - LANtastic - LOGIN TO SERVER
INT 21 - LANtastic - LOGOUT FROM SERVER
INT 21 - LANtastic - GET USERNAME ENTRY
INT 21 - LANtastic - GET INACTIVE SERVER ENTRY
INT 21 - LANtastic - CHANGE PASSWORD
INT 21 - LANtastic - DISABLE ACCOUNT
INT 21 - LANtastic v3+ - GET ACCOUNT
INT 21 - LANtastic - COPY FILE
INT 21 - LANtastic - SEND UNSOLICITED MESSAGE
INT 21 - LANtastic - GET LAST RECEIVED UNSOLICITED MESSAGE
INT 21 - LANtastic - GET MESSAGE PROCESSING FLAG
INT 21 - LANtastic - SET MESSAGE PROCESSING FLAG
INT 21 - LANtastic v3+ - POP UP LAST RECEIVED MESSAGE
INT 21 - LANtastic - GET QUEUE ENTRY
INT 21 - LANtastic - SET QUEUE ENTRY
INT 21 - LANtastic - CONTROL QUEUE
INT 21 - LANtastic v3+ - GET PRINTER STATUS
INT 21 - LANtastic v3+ - GET STREAM INFO
INT 21 - LANtastic v3+ - SET STREAM INFO
INT 21 - LANtastic - CREATE USER AUDIT ENTRY
INT 21 - LANtastic - GET ACTIVE USER INFORMATION
INT 21 - LANtastic - GET SHARED DIRECTORY INFORMATION
INT 21 - LANtastic v3+ - GET USERNAME FROM ACCOUNT FILE
INT 21 - LANtastic v3+ - TRANSLATE PATH
INT 21 - LANtastic v3+ - CREATE INDIRECT FILE
INT 21 - LANtastic v3+ - GET INDIRECT FILE CONTENTS
INT 21 - LANtastic - GET TIME FROM SERVER
INT 21 - LANtastic - GET REDIRECTED PRINTER TIMEOUT
INT 21 - LANtastic - SET REDIRECTED PRINTER TIMEOUT
INT 21 - LANtastic - GET DOS SERVICE VECTOR
INT 21 - LANtastic - SET DOS SERVICE VECTOR
INT 21 - LANtastic - GET MESSAGE SERVICE VECTOR
INT 21 - LANtastic - SET MESSAGE SERVICE VECTOR
INT 21 - DOS 3+ internal - RESOLVE PATH STRING TO CANONICAL PATH STRING
INT 21 - DOS 3+ internal - UNUSED
INT 21 - DOS 3+ - GET PSP ADDRESS
INT 21 - DOS 2.25 only - GET LEAD BYTE TABLE (2-BYTE CHARACTER SUPPORT)
INT 21 - Asian DOS 3.2+ only - GET DOUBLE BYTE CHARACTER SET LEAD TABLE
INT 21 - Asian DOS 3.2+ only - SET KOREAN (HONGEUL) INPUT MODE
INT 21 - Asian DOS 3.2+ only - GET KOREAN (HONGEUL) INPUT MODE
INT 21 - DOS 3.2 internal - GET/SET ???
INT 21 - DOS 3.3+ internal - SET ???
INT 21 - DOS 3.3+ - GET EXTENDED COUNTRY INFORMATION
INT 21 - DOS 4.x internal - COUNTRY-DEPENDENT CHARACTER CAPITALIZATION
INT 21 - DOS 4.x internal - DETERMINE IF CHARACTER REPRESENTS YES/NO RESPONSE
INT 21 - DOS 4.x internal - COUNTRY-DEPENDENT FILENAME CAPITALIZATION
INT 21 - DOS 3.3+ - GET GLOBAL CODE PAGE TABLE
INT 21 - DOS 3.3+ - SET GLOBAL CODE PAGE TABLE
INT 21 - DOS 3.3+ - SET HANDLE COUNT
INT 21 - DOS 3.3+ - COMMIT FILE, WRITE ALL BUFFERED DATA TO DISK
INT 21 - DOS 4.0 internal - GET/SET DISK SERIAL NUMBER
INT 21 - DOS 4.0 internal - ???
INT 21 - DOS 4.0 internal - ???
INT 21 - DOS 4.0 - EXTENDED OPEN/CREATE
INT 21 - ???
INT 21 - Attachmate Extra - GET 3270 DISPLAY STATE
INT 21 - Attachmate Extra - SET 3270 DISPLAY STATE
INT 21 - Attachmate Extra - SET HOST WINDOW STATE
INT 21 - Attachmate Extra - SEND KEYSTROKES TO HOST WINDOW
INT 21 - Attachmate Extra - GET HOST WINDOW BUFFER ADDRESS
INT 21 - Attachmate Extra - GET HOST WINDOW CURSOR POSITION
INT 21 - Attachmate Extra - GET TRANSLATE TABLE ADDRESS
INT 21 - Novell NetWare shell 3.01 - TASK MODE CONTROL
INT 21 - Novell NetWare SFT Level II - EXTENDED FILE ATTRIBUTES
INT 21 - Novell Advanced NetWare 2.0+ - PRINT JOBS
INT 21 - Attachmate Extra - DISABLE HOST BUFFER UPDATES
INT 21 - Novell NetWare 4.0 - SET END OF JOB STATUS
INT 21 - Novell NetWare 4.6 - LOG/LOCK PHYSICAL RECORD
INT 21 - Novell NetWare 4.6 - RELEASE PHYSICAL RECORD
INT 21 - Novell NetWare 4.6 - CLEAR PHYSICAL RECORD
INT 21 - Novell NetWare 4.6 - LOG/LOCK RECORD (FCB)
INT 21 - Novell NetWare 4.6 - RELEASE RECORD (FCB)
INT 21 - Novell NetWare 4.6 - CLEAR RECORD (FCB)
INT 21 - Novell NetWare 4.6 - LOCK PHYSICAL RECORD SET
INT 21 - Novell NetWare 4.6 - RELEASE PHYSICAL RECORD SET
INT 21 - Novell NetWare 4.6 - CLEAR PHYSICAL RECORD SET
INT 21 - Novell NetWare 4.6 - SEMAPHORES
INT 21 - Novell NetWare 4.6 - GET OR SET LOCK MODE
INT 21 - Novell NetWare 4.0 - TTS
INT 21 - Novell NetWare 4.0 - BEGIN LOGICAL FILE LOCKING
INT 21 - Novell NetWare 4.0 - END LOGICAL FILE LOCKING
INT 21 - Novell NetWare 4.0 - LOG/LOCK PERSONAL FILE (FCB)
INT 21 - Novell NetWare 4.0 - LOCK FILE SET
INT 21 - Novell NetWare 4.0 - RELEASE FILE (FCB)
INT 21 - Novell NetWare 4.0 - RELEASE FILE SET
INT 21 - Novell NetWare 4.0 - CLEAR FILE (FCB)
INT 21 - Novell NetWare 4.0 - CLEAR FILE SET
INT 21 - Novell NetWare 4.6, Banyan VINES - LOCK LOGICAL RECORD
INT 21 - Novell NetWare 4.6, Banyan VINES - LOCK LOGICAL RECORD SET
INT 21 - Novell NetWare 4.0, Banyan VINES - UNLOCK LOGICAL RECORD
INT 21 - Novell NetWare 4.0, Banyan VINES - UNLOCK LOGICAL RECORD SET
INT 21 - Novell NetWare 4.0, Banyan VINES - CLEAR LOGICAL RECORD
INT 21 - Novell NetWare 4.0, Banyan VINES - CLEAR LOGICAL RECORD SET
INT 21 - Novell NetWare 4.0 - END OF JOB
INT 21 - Novell NetWare 4.0 - SYSTEM LOGOUT
INT 21 - Novell NetWare, Banyan VINES - ALLOCATE RESOURCE
INT 21 - Novell NetWare, Banyan VINES - DEALLOCATE RESOURCE
INT 21 - Novell NetWare 4.0 - GET VOLUME STATISTICS
INT 21 - Novell NetWare 4.0 - GET NUMBER OF LOCAL DRIVES
INT 21 - Novell NetWare 4.0, Banyan VINES - GET STATION NUMBER
INT 21 - PCMag PCMANAGE/DCOMPRES - TURN ON/OFF
INT 21 - Novell NetWare 4.0 - SET ERROR MODE
INT 21 - Novell NetWare 4.0 - SET BROADCAST MODE
INT 21 - Novell NetWare 4.0 - CAPTURE
INT 21 - Novell NetWare 4.0 - PRINT SPOOLING
INT 21 - OS/286, OS/386 - INITIALIZE REAL PROCEDURE
INT 21 - Novell NetWare 4.0 - BROADCAST MESSAGES
INT 21 - OS/286, OS/386 - ISSUE REAL PROCEDURE CALL
INT 21 - Novell NetWare 4.0 - DIRECTORY FUNCTIONS
INT 21 - OS/286, OS/386 - SET REAL PROCEDURE SIGNAL HANDLER
INT 21 - Novell NetWare 4.0 - CONNECTION CONTROL
INT 21 - OS/286, OS/386 - ISSUE REAL INTERRUPT
INT 21 - Novell NetWare 4.0 - SET FILE ATTRIBUTES (FCB)
INT 21 - DoubleDos - INSTALLATION CHECK
INT 21 - OS/286, OS/386 - CHAIN TO REAL-MODE HANDLER
INT 21 - OS/286, OS/386 - SET PROTECTED-MODE TASK GATE
INT 21 - OS/286, OS/386 - REMOVE PROTECTED-MODE TASK GATE
INT 21 - Novell NetWare 4.0 - UPDATE FILE SIZE (FCB)
INT 21 - OS/286, OS/386 - HEAP MANAGEMENT STRATEGY
INT 21 - OS/286, OS/386 - FORCE HEAP COMPACTION
INT 21 - Novell NetWare 4.0 - COPY FILE TO FILE (FCB)
INT 21 - OS/286, OS/386 - ISSUE REAL PROCEDURE SIGNAL FROM PROTECTED MODE
INT 21 - Novell NetWare 4.0, Banyan VINES - GET FILE SERVER DATE AND TIME
INT 21 - OS/286, OS/386 - CREATE CODE SEGMENT
INT 21 - Novell NetWare 4.6 - SET FCB RE-OPEN MODE
INT 21 - OS/286, OS/386 - SEGMENT CREATION
INT 21 - OS/286, OS/386 - CHANGE SEGMENTS
INT 21 - Novell NetWare 4.6 - SHELL'S "GET BASE STATUS"
INT 21 - Novell NetWare shell 3.01 - MAP A FAKE ROOT DIRECTORY
INT 21 - Novell NetWare shell 3.01 - DELETE FAKE ROOT DIRECTORY
INT 21 - Novell NetWare shell 3.01 - GET RELATIVE DRIVE DEPTH
INT 21 - Novell NetWare shell 3.01 - SET SHOW DOTS
INT 21 - Novell NetWare 4.6 - RETURN SHELL VERSION
INT 21 - DoubleDOS - TURN OFF TASK SWITCHING
INT 21 - OS/286, OS/386 - ALLOCATE HUGE SEGMENT
INT 21 - Novell NetWare 4.6 - LOG FILE
INT 21 - DoubleDOS - TURN ON TASK SWITCHING
INT 21 - OS/386 VMM - GET A PAGE TABLE ENTRY BY LINEAR ADDRESS
INT 21 - OS/386 VMM - GET A PAGE TABLE ENTRY BY 16-BIT SEGMENT:OFFSET
INT 21 - OS/386 VMM - FREE MAPPED PAGES
INT 21 - OS/386 VMM - GET A PAGE TABLE ENTRY BY 32-BIT SEGMENT:OFFSET
INT 21 - OS/386 VMM - MAP PAGES
INT 21 - OS/386 VMM - LOCK PAGES IN MEMORY
INT 21 - OS/386 VMM - UNLOCK MEMORY PAGES
INT 21 - Novell NetWare 4.6 - RELEASE FILE
INT 21 - DoubleDOS - GET VIRTUAL SCREEN ADDRESS
INT 21 - OS/286, OS/386 - BLOCK TRANSFER
INT 21 - Novell NetWare - CLEAR FILE
INT 21 - OS/286, OS/386 - GET SEGMENT OR WINDOW DESCRIPTOR
INT 21 - Novell NetWare 4.6 - GET PHYSICAL STATION NUMBER
INT 21 - DoubleDOS - GIVE AWAY TIME TO OTHER TASKS
INT 21 - Novell Advanced NetWare 1.0+ - GET DRIVE INFO
INT 21 - Novell Advanced NetWare 1.0+ - CONNECTION ID
INT 21 - Novell Advanced NetWare 1.0+ - FILE SERVER CONNECTION
INT 21 - Novell NetWare - ???
INT 21 - Novell Advanced NetWare 2.0+ - FILE SERVER FILE COPY
INT 21 - DOS v??? - SET OEM INT 21 HANDLER
INT 21 - DOS v??? - OEM FUNCTION
INT 21 - DOS v??? - OEM FUNCTION
INT 21 - DOS v??? - OEM FUNCTION
INT 21 - DOS v??? - OEM FUNCTION
INT 21 - DOS v??? - OEM FUNCTION
INT 21 - DOS v??? - OEM FUNCTION
INT 21 - PCMag PCMANAGE/DCOMPRES - INSTALLATION CHECK
INT 21 - DOS v??? - OEM FUNCTION
INT 21 - CED - INSTALLABLE COMMANDS
INT 21 - Topware Network Operating System - ???