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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    This function call, along with Int 15H Functions 81H and 82H, defines a
    simple protocol that can be used to arbitrate usage of devices by
    multiple processes. A multitasking program manager would be expected to
    capture Int 15H and provide the appropriate service. The default BIOS
    routine for this function simply returns with the carry flag clear and
    AH=00H.
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