You can choose to enter commands interactively from DCL, or enter
    the utility and issue commands from the xauth command line.

    Note that SYS$LOGIN:DECW$XAUTHORITY.DECW$XAUTH is the default X
    authority file. If you want to work with an alternate file, use
    the -f option on the command line to specify the filename, as
    follows:

    $ XAUTH -f SYS$SYSROOT:[SYSMGR]UNTRUSTED.DECW$XAUTH
    Using authority file SYS$SYSROOT:[SYSMGR]UNTRUSTED.DECW$XAUTH

    xauth>

    Tips and Shortcuts

    o  If you are working with an X authority file other than the
       default, and plan to enter a series of commands, use the XAUTH
       -f command to enter the utility; then issue the subsequent
       commands from the utility command line. Otherwise, you will
       need to reenter the fully-qualified filename with each xauth
       command issued from the DCL command line.

    o  When adding a file entry, you can specify a period (.) in
       place of the value MIT-MAGIC-COOKIE-1. The period is replaced
       by the name of the authentication protocol.