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        Appc/pc

        Entry:
          AH = 03h
           DS:DX -> control block (see below)

        Format of control block:

        Offset  Size    Description
         00h 12 BYTEs   reserved
         0Ch    WORD    verb (action)
         0Eh  6 BYTEs   0
         14h    DWORD   (high byte first) return code (see AH=01h)
         18h    WORD    0
         1Ah  8 BYTEs   (high byte first) logical unit ID
        ---if verb=2400h (TP Started), control block continues---
         22h  8 BYTEs   (high byte first) TP ID
        ---if verb=2800h (Get ALLOCATE), control block continues---
         22h    BYTE    type
                        00h dequeue
                        01h test
         23h    DWORD   pointer to CREATE_TP record
        ---if verb=2A00h (Change Logical Unit). control block continues---
         22h    DWORD   pointer to CREATE_TP_EXIT routine
                        FFFFFFFFh reject incoming ALLOCATEs
                        00000000h queue ALLOCATEs
         26h    DWORD   00000000h
         2Ah    DWORD   pointer to SYSTEM_LOG_EXIT routine, FFFFFFFFh= don't log errors
         2Eh    DWORD   00000000h
         32h    BYTE    maximum TPs
         33h    BYTE    00h stop QUEUE_ALLOCATEs
                        01h resume QUEUE_ALLOCATEs
         34h    DWORD   pointer to LU_LU_PASSWORD_EXIT routine, FFFFFFFFh = no exit
         38h    DWORD   00000000h