All logins call this routine after the password is authenticated
    to allow the site to check other access restrictions. The site
    may check its own access restrictions and any of the following
    OpenVMS access restrictions:

    Access
    Restriction        Callback Routine Used to Check Restriction

    Account            LGI$ICB_ACCTEXPIRED
    expiration
    Password           LGI$ICB_PWDEXPIRED
    expiration
    Account disabled   LGI$ICB_DISUSER
    Access modes and   LGI$ICB_MODALHOURS
    times