Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 3Bh
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     The function fails if any element of the path name does not exist.
 
     Int 21h Function 47h can be used to obtain the name of the current
     directory before using Int 21h Function 3Bh to select another so
     that the original directory can be restored later.
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