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Int 68 Fn 04 - Appc/pc - Transaction Processing [N]
AH = 04h
DS:DX -> control block (see below)
Return: control block updated
Format of control block:
Offset Size Description
00h 12 BYTEs reserved
0Ch WORD verb (action)
2500h TP_ENDED
2900h TP_VALID
0Eh 6 BYTEs 00h
14h DWORD (big-endian) return code (see AH=01h/SF=1B00h)
18h WORD 00h
1Ah 8 BYTEs (big-endian) TP_ID
22h DWORD -> CREATE_TP record (only if verb = 2900h)
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