INT 21,44,A / IOCTL,A - Handle Local or Remote Query

	AH = 44h
	AL = 0A
	BX = handle


	on return
	AX = error code if CF set  (see DOS ERROR CODES)
	DX = device attribute word
	     bit 15 = 1 if drive is remote
	     bit 15 = 0 if drive is local


	- used to determine if block device is local or remote
	- returns invalid function if networking not started
	- implemented from DOS 3.1