Important Notice

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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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▀ The parameter returned in CX is a value that was previously passed to
  MS-DOS in register CX with Int 21H Function 5FH Subfunction 03H (Redirect
  Device). It represents data that is private to the applications which
  store and retrieve it, and has no meaning to MS-DOS.
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