/STATIC_RATING=rating
       /NOSTATIC_RATING

    Enables or disables dynamic service ratings. A dynamic service
    rating means that a LAT algorithm calculates the availability
    of a service dynamically, based on the overall level of activity
    of the node that offers the service and the amount of memory.
    When a terminal server or node requests a connection to a service
    that is offered on two or more service nodes, the requesting
    node selects the service node with the highest (most favorable)
    service rating. This selection process is called load balancing.

    The dynamic service rating, which is the default, is usually
    adequate for efficient load balancing on the LAT network.
    However, when necessary, you can use the /STATIC_RATING qualifier
    to disable dynamic service ratings so that you can specify a
    static (fixed) rating. That static rating value does not change
    until the dynamic service rating is reenabled.

    Use the static rating to direct users away from or toward your
    node temporarily. Static ratings range from 0 to 255. Specify a
    low value to make the local service node less likely to be used;
    specify a high value to make the local service node more likely
    to be used.

    If you do not specify either the /STATIC_RATING or /NOSTATIC_
    RATING qualifier, the default is that the LAT software uses the
    dynamic service rating.

    Limited and application services do not rely exclusively on
    the dynamically calculated service rating. Instead, they use
    a portion of the dynamic rating based on how many ports are
    available for the service. For example, if a limited service
    has 50 percent of its ports available, the dynamic service rating
    will be scaled, halved, and then added to 105. When ports are
    available, the rating will always be above the value 105.

    When all ports for a limited or application service are in use,
    the rating will be based on the scaled dynamic rating and the
    number of free queue slots on the local node. The rating will
    always be less then 90.

    This rating procedure for limited and application services
    follows the terminal server rating algorithm for services and
    available ports that the service offers, while at the same time
    taking into account the availability of the node (which is the
    factor used to calculate the dynamic rating).

    If your system is licensed for a specific number of units (where
    only a fixed number of users can log in to the system regardless
    of how the login limit is set), then all dynamic ratings become 0
    when all OpenVMS license units have been consumed. (This forces
    all node service ratings to the lowest possible value when logins
    are not possible because all OpenVMS license units have been
    consumed.)

    Note as well that the LAT software transmits a service
    announcement message when a user logs in to or out of the system.
    This allows the system to more quickly provide information
    about service rating changes that result from a login or logout
    operation.