Int 7F Fn 07  - G8bpq V4.00+ - Host Mode - Get Buffer Counts For Stream    [N]

   AH = 07h
   AL = stream number (01h-40h)

Return: BX = number of pending receive frames
   CX = number of unacknowledged sent frames
   DX = number of buffers available

See Also: AH=02h"G8BPQ",AH=03h"G8BPQ"