o  required argument omitted

    Communications port is a required argument for this command.

 o  already exists

    An fddi station by that instance name already exists.

 o  no such object instance

    The FDDI module has probably not been created yet.   On OpenVMS,
    verify the contents of your NET$FDDI_STARTUP.NCL script.  You
    may need to run net$configure to reconfigure your devices.