Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 3Ah
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     The function fails if
 
        ■ Any element of the path name does not exist.
        ■ The specified directory is also the current directory.
        ■ The specified directory contains any files.
        ■ [Version 3.0+] The program is running on a network and the user
          running the program has insufficient access rights.
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