Int 61 Fn 0001  - Banyan Vines - "sowait" - Wait For Asynchronous Event C  [N]

   AX = 0001h subfn 0005h
   DS:DX -> communications control block (function 0005h)

Return: AX = status (see below)

Notes: Banyan can use any interrupt from 60h through 66h.  The Banyan
     interrupt handler is identified by the string "BANV" in the four
     bytes immediately preceding the interrupt handler
   returns results for all asynchronous operations invoked from the
     data segment used for this call

See Also: AX=0001h/SF=0002h,AX=0001h/SF=0009h

Values for status:
 0000h successful
 0001h service not installed
 0002h invalid service ID
 0003h-000Ah reserved for BANV interface errors
 00A2h no more buffer space available
 00A3h timeout event

Format of control block:
Offset Size    Description
 00h   WORD    0005h
 02h   WORD    pointer to argument block (see below)
 04h   WORD    error return code
 06h  4 BYTEs  reserved

Format of argument block:
Offset Size    Description
 00h   WORD    pointer to WORD event pointer
 02h   WORD    timeout in multiples of 200ms, FFFFh = infinite