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Int 2F Fn CB07 - Communicating Applications Specification - Open File [F]
AX = CB07h
BX = event handle from find (AL=05h,06h) or submit task (AL=01h)
CX = receive file number (ignored for task queue and log queue)
0000h open receive control file
N open Nth received data file
DL = queue
00h task queue
01h receive queue control file or received file, as given by CX
02h log queue
03h group file in task queue (v1.2+)
04h group file in log queue (v1.2+)
Return: AX = 0000h successful
BX = DOS file handle for requested file
AX < 0 error code (see AX=CB01h)
Note: the returned file handle has been opened in read-only mode and should
be closed with INT 21/AH=3Eh after use
See Also: AX=CB01h,AX=CB05h,AX=CB14h
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