Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 5Fh Subfunction 02h
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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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