INT 7F - Alloy NTNX, MW386 - CHANNEL CONTROL - RELEASE BUFFER                   
	AH = 10h
	CL = 04h
	AL = channel number
Return: AL = status (00h-03h) (see #03951)
Notes:	unlocks buffer after received datagram has been processed
	may not be invoked from within a hardware interrupt handler
SeeAlso: AH=10h/CL=00h