INT 7F - Alloy NTNX, MW386 - CHANNEL CONTROL - UNLOCK CHANNEL                   
	AH = 10h
	CL = 03h
	AL = channel number
Return: AL = status (00h-03h,0Ah) (see #03951)
Notes:	should only be used on channels locked with AH=10h/CL=02h, not on those
	  locked by receipt of a datagram
	may not be invoked from within a hardware interrupt handler
SeeAlso: AH=10h/CL=02h,AH=10h/CL=04h,AH=10h/CL=09h