The LOGINOUT (LGI) routines are used by programmers implementing
    the requirements of site security administrators or third-party
    security software producers.

    The LGI routines do not deal strictly with callable routines that
    are internal to the OpenVMS system. The LOGINOUT callout routines
    (whose names begin with LGI$ICR_) are designed by site security
    administrators. The callback routines (whose names begin with
    LGI$ICB_) are invoked by the callout routines.