Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 5Fh Subfunction 04h
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  Interrupt:   21h     Function:   5Fh     Subfunction:   04h
 
  Title:       Cancel Device Redirection [Version 3.1+]
 
  Description:
 
     Cancels a previous redirection request by removing the association
     of a local device name with a network name. This function call is
     only available when Microsoft Networks is running and the
     file-sharing module (SHARE.EXE) has been loaded.
 
     Input                       Output
 
     AH = 5Fh                    If function successful
     AL = 04h                      Carry flag: clear
     DS:SI = segment:offset
             of ASCIIZ local     If function unsuccessful
             device name           Carry flag: set
                                   AX = Error code (01h, 03h, 05h, 08h,
                                        0Fh, or 12h)
                                        See: Error codes
                                    -♦-