Blackout Window
Once the notification window is complete, the blackout window starts.
At this point, all non-administration users will be logged out of
the system. An error message will be displayed if a user attempts
to log in
Figure 19-6 Blackout Error Message (Non-Administration User)

Administration users can log in and after logging in or if already
logged in, warning message will be displayed that the application
is in blackout window mode.
Figure 19-7 Blackout Error Message (Administration User)
