/XAUTHORITY=[filespec] (Alpha/Integrity servers only)
       /NOXAUTHORITY (Alpha/Integrity servers only)

    Directs the display device to use a specific X authority file
    when connecting the X display server. The X authority file
    contains data that grants or restricts access to the X display
    server depending on the authorization protocol in use. If a file
    specification is not entered with this qualifier, the default
    of SYS$LOGIN:DECW$XAUTHORITY.DECW$XAUTH is used. If the file
    specification is entered and the file does not currently exist,
    it is created automatically when an entry is made into the file.

    Note that with this qualifier, all X authority file
    specifications resolve to a physical device (rather than a
    logical device) in order to remain available to other detached
    processes. If you specify a search list, and the file is not
    found, the X authority file specification resolves to the first
    directory in the search list.

    Use /NOXAUTHORITY to clear the setting and return to the file
    referenced by the DECW$XAUTHORITY logical or the default file if
    the logical is not defined.