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Int 0x21, AH=0x64

2164 INT 21 - DOS 3.2+ internal - SET DEVICE DRIVER LOOKAHEAD FLAG
2164--DX0000 INT 21 U - OS/2 v2.0+ Virtual DOS Machine - ENABLE AUTOMATIC TITLE SWITCH
2164--DX0001 INT 21 U - OS/2 v2.0+ Virtual DOS Machine - SET SESSION TITLE
2164--DX0002 INT 21 U - OS/2 v2.0+ Virtual DOS Machine - GET SESSION TITLE
2164--DX0003 INT 21 U - OS/2 v2.1 Virtual DOS Machine - GET LASTDRIVE
2164--DX0004 INT 21 U - OS/2 v2.1+ Virtual DOS Machine - GET SIZE OF PTDA JFT
2164--DX0005 INT 21 U - OS/2 v2.1+ Virtual DOS Machine - GET SECOND SFT FLAGS WORD
2164--DX0006 INT 21 U - OS/2 v2.1+ Virtual DOS Machine - UNLOAD DOSKRNL SYMBOLS & LOAD PROGR
2164--DX0007 INT 21 U - OS/2 v2.1+ Virtual DOS Machine - GET WinOS2 CALL GATE ADDRESS
2164--DX0008 INT 21 U - OS/2 v2.1+ Virtual DOS Machine - GET LOADING MESSAGE
2164--CX636C INT 21 U - OS/2 v2.1+ Virtual DOS Machine - OS/2 API support
2164--BX0025 INT 21 U - OS/2 v2.1+ Virtual DOS Machine - OS/2 API DOS32StartSession
2164--BX00B6 INT 21 U - OS/2 v2.1+ Virtual DOS Machine - OS/2 API DosQFSAttach
2164--BX00CB INT 21 U - OS/2 v2.1+ Virtual DOS Machine - OS/2 API DosForceDelete

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