Specifying_an_X_Authority_File

   By default, the X authority file referenced by client
   applications and the xauth utility is defined as
   SYS$LOGIN:DECW$XAUTHORITY.DECW$XAUTH. You can override this
   default and specify an alternate X authority file in either of
   the following ways:

   o  You can create alternate X authority files and switch between
      them using the DECW$XAUTHORITY logical. For example, the
      following command changes the X authority file in use for
      the current DECwindows Motif session to UNTRUSTED.DECW$AUTH:

      $  DEFINE DECW$XAUTHORITY-
      _$ SYS$MANAGER:[SYSMGR]UNTRUSTED.DECW$XAUTH

      The logical definition remains in use until it is
      redefined or an alternate value is specified using the SET
      DISPLAY/XAUTHORITY command.

   o  If a display device is used to create a client connection to
      an X server, you can specify an alternate X authority file
      using the SET DISPLAY/CREATE/XAUTHORITY command. Note that the
      file specified on this command line overrides both the default
      and any file referenced by the DECW$XAUTHORITY logical.