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Int 15h, 4Fh            Keyboard Intercept                               many

    Called by the hardware keyboard handler (Int 09h), allowing the
    replacement or removal of a key.

        Entry   AH = 4Fh
                AL = Scan code

        Return  CF   Cleared if scan code removed, else set
                AL = New scan code if changed, else original scan code

    ------------------------------------------------------------------

    Upon entry to this service, AL will contain the scan code of the
    keystroke. If the user wishes to change the scan code, put the new
    scan code in AL and set the Carry Flag. If the scan code is to
    remain the same, then leave AL alone and set the Carry Flag. The
    user can remove or ignore the keystroke by returning with the
    Carry Flag clear.


    This service is not available for the PC, PCjr, XT dated 11/08/82,
    and the AT dated 1/10/84.

    By writing a handler for this service, the user can change the
    meaning of a key. The operating system normally will return the
    scan code unchanged (that is, it will leave AL alone and return
    with the Carry Flag set).

    To determine the machines that support this feature, see Service
    C0h (Return System Configuration).