The STARTUP ADD command adds a component to the startup database.
    Startup components are the command procedures or executable files
    that perform actual startup work. Files from the startup database
    are used to start the operating system, site-specific programs,
    and layered products. STARTUP$STARTUP_VMS and STARTUP$STARTUP_
    LAYERED list the components of the startup database.

    Because an OpenVMS Cluster typically shares one copy of the
    startup database, the SYSMAN environment can be defined as
    clustered or as a single node within the cluster.