INT 16 - Shamrock Software EMAIL - SEND RESULT OF USER FUNCTION                 
	AX = 4505h
	DL = port number (01h = COM1)
	DH = error flag
	    bit 3: set on error
	ES:BX -> 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. text to return to user, max 1024 bytes
Return: AH = 4Dh if EMAIL installed on specified port
	AL = status
	    00h successful
	    02h unable to perform function (timeout, prev call not complete)
	    other error
Notes:	if the error flag in DH is set, the string is not sent and an error
	  message is generated instead; if this function is not called within
	  five seconds of AX=4504h, EMAIL automatically generates an error
	  message
	the string is copied into an internal buffer, allowing this function's
	  caller to continue immediately
SeeAlso: AX=4503h,AX=4504h,INT 17/AX=2400h