VMS Help LGI Routines, LGI$ICB_VALIDATE, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The site can use this callback routine to validate the user name
    and the user's primary and secondary passwords against the system
    authorization file (SYSUAF.DAT). The routine also:

    o  Updates the user authorization (UAF) record with information
       about login failures

    o  Performs security auditing

    o  Performs break-in detection and intrusion evasion