Int 7F Fn 10  - Alloy Ntnx, Mw386 - Channel Control - Release Buffer       [N]

   AH = 10h
   CL = 04h
   AL = channel number

Return: AL = status (00h-03h) (see #3622)

Notes: unlocks buffer after received datagram has been processed
   may not be invoked from within a hardware interrupt handler

See Also: AH=10h/CL=00h