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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    An operating system or a resident utility can capture this function to
    filter the raw keyboard data stream. The new handler can substitute a new
    scan code, return the same scan code, or return the carry flag clear
    causing the keystroke to be discarded. The ROM BIOS default routine
    simply returns the scan code unchanged.
 
    A program can call Int 15H Function C0H to determine whether the host
    machine's ROM BIOS supports this keyboard intercept.
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