Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 15h Function 4Fh
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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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