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Int 16 Fn 4503 - Shamrock Software EMail - Specify Command-word For User [e]
AX = 4503h
DL = port number (01h = COM1)
DH = maximum execution time in clock ticks (00h = 5 seconds)
ES:BX -> ASCIZ string with new user command-word
Return: AX = 4D00h if EMAIL installed on specified port
Notes: a single user command (consisting of only uppercase letters and digits)
may be defined, and remains valid until it is overwritten or the
EMAIL program terminates; the user command must be activated by
calling AX=4504h at least once.
an existing command word may be redefined with this function
See Also: AX=4504h,AX=4505h
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