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The Notification system takes care of displaying/handling
messages that were pushed since the last time the message stack was
checked. The PHP code to display any messages that are to be output to
the screen looks like this:
<?php
$notification->notify();
?>
Nice and simple. The Notification system stores a stack of
messages in the user's session, so if you push an error and then don't
display it immediately, it will still be stored, and will be displayed
the next time that the message stack is checked.
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