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INT 16 - Shamrock Software EMAIL - CHECK FOR USER FUNCTION COMMAND-WORD
        AX = 4504h
        DL = port number (01h = COM1)
        ES:BX -> 80-byte buffer for ASCIZ user input line
Return: AX = 4D00h if EMAIL installed on specified port
            DL = flags
                bit 0: user function supported (always set)
                    1: user entered user-function command word
            if DL bit 1 set,
                ES:BX buffer contains line entered by user which begins with
                        the defined command word and has been converted to all
                        caps
Note:   caller must process the returned commandline and invoke AX=4505h
          within five seconds with the result of that processing
SeeAlso: AX=4505h

See Also: 164503
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