Int 16h, 05h            Keyboard Write                                   many

    Puts a scan code/character code combination in the keyboard
    buffer.

        Entry   AH = 05h
                CH = Scan code
                CL = ASCII character code

        Return  AL = 00h - Operation successful
                     01h - Buffer full

    ──────────────────────────────────────────────────────────────────

    This service is available only for ATs dated 11/15/85 and after,
    and XT 286s.

    This service "fools" a program into thinking that keys have come
    from the keyboard. A good example of this would be the operation
    needed by a program that implements keyboard macros.

    For a description and list of scan codes, see "Scan Codes."