qa.hlp (Table of Contents; Topic list)
Int 21H Function 5FH Subfunction 03H
   Summary  Notes  Back
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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 which store and retrieve it, and has no meaning to MS-DOS.
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