qa.hlp (Table of Contents; Topic list)
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Int 21H Function 5FH Subfunction 04H
   Summary  Notes  Back
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▀ The supplied name can be a drive designator (a letter followed by a
  colon, such as "D:"), a printer name, or a string starting with two
  backslashes (\\). Printer names must be one of the following: PRN, LPT1,
  LPT2, or LPT3. If the string with two backslashes is used, the connec-
  tion between the local machine and the network directory is terminated.
                                    -♦-