VMS Help LANCP, SET, DEVICE parameters, Qualifiers, /PERMANENT_DATABASE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Updates the device entries in the LAN volatile device database
    with any data currently set in the permanent database. This
    allows you to update the volatile database after changing data
    in the permanent database, rather than repeating the commands for
    each updated entry to apply the changes to the volatile database.