INT 2A CU - NETWORK - KEYBOARD BUSY LOOP                                        
	AH = 84h
Notes:	similar to DOS's INT 28h, called from inside the DOS keyboard input
	  loop (i.e. INT 21/AH=07h or INT 21/AH=08h) to allow the network
	  software to process requests
	Novell DOS 7+ calls this function with AX=8400h from inside of
	  the keyboard input loop.
SeeAlso: INT 28