INT 16 - Shamrock Software EMAIL - MONITOR XMODEM DOWNLOAD                      
	AX = 4506h
	DL = port number (01h = COM1)
	ES:BX -> 13-byte buffer for ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. filename
Return: AX = 4D00h if EMAIL installed on specified port
	    DH = Xmodem status
		00h no XGET command given
		01h XGET in progress
		02h XGET completed successfully
	    ES:BX buffer filled with last filename given to XGET command
		(without path)
Note:	DH=02h will only be returned once per XGET; subsequent calls will
	  return DH=00h
SeeAlso: AX=4500h,INT 17/AX=2408h