INT 2F,4 - Multiplex Interrupt - Pause / return status

	AL = 04
	AH = 01  resident portion of PRINT
	     02  resident portion of ASSIGN
	     10  resident portion of SHARE
	     B7  resident portion of APPEND
	     C0-FF reserved for user applications


	on return:
	DX = error count
	DS:SI = pointer to queue of files


	- each file in the queue is represented by 64 byte filename
	- the file currently being printed is the first entry in the queue
	- the last entry in the queue is a null string