Invokes the Galaxy Configuration Utility (GCU) to monitor,
    display, and interact with an OpenVMS Galaxy system. The GCU
    requires DECwindows Motif V1.2-4 or greater and ALPHA OpenVMS
    V7.2 or greater.

    The optional model parameter specifies the location and name of
    a Galaxy Configuration Model to load and display. If no model
    is provided and the system is running as an OpenVMS Galaxy, the
    current active configuration is displayed.

    If the system is not running as an OpenVMS Galaxy, the GCU will
    assist the user in creating a single-instance OpenVMS Galaxy
    system.

    OpenVMS Galaxy Configuration Models are created with the Galaxy
    Configuration Utility. See the VSI OpenVMS Alpha Partitioning and
    Galaxy Guide and GCU online help for more information.