Int 68 Fn 03  - Appc/pc - Tp Started                                       [N]

   AH = 03h subfn 2400h
   DS:DX -> control block (see #3370)

Return: control block updated

Format of APPC/PC "TP Started" control block:
Offset Size    Description (Table 3370)
 00h 12 BYTEs  reserved
 0Ch   WORD    2400h (verb "TP Started")
 0Eh  6 BYTEs  00h
 14h   DWORD   (big-endian) return code (see #3339)
 18h   WORD    00h
 1Ah  8 BYTEs  (big-endian) logical unit ID
 22h  8 BYTEs  (big-endian) TP ID