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  Interrupt:   2Fh     Function:   06h
 
  Title:       ASSIGN [Version 3.0+]
 
  Description:
 
     Returns a code indicating whether the resident portion of the
     ASSIGN utility has been loaded.
 
     Input                        Output
 
     AH = 06h                     If function successful
     AL = Subfunction               Carry flag: clear
          00h = Get Installed       AL = ASSIGN installed status
                State                  = 00h (if not installed, OK to
                                              install)
                                       = 01h (if not installed, not OK
                                              to install)
                                       = FFh (if installed)
 
                                  If function unsuccessful
                                    Carry flag: set
                                    AX = Error code
                                    -♦-