Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 5Fh Subfunction 03h
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     The local name can be a drive designator (a letter followed by a
     colon, such as "D:"), a printer name, or a null string. Printer
     names must be one of the following: PRN, LPT1, LPT2, or LPT3. If a
     null string followed by a password is used, MS-DOS attempts to
     grant access to the network directory with the specified password.
 
     The parameter passed in CX can be retrieved by later calls to Int
     21h Function 5Fh Subfunction 02h. It represents data that is
     private to the applications that store and retrieve it, and has
     no meaning to MS-DOS.
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