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How to (un)archive posts automatically
Obtain csArchiver.pl from the miscellaneous add ons page (which is here), and use that to process your posts.
Message Boards and Forums
WebGUI's Collaboration System can be used to create forums. WebGUI also contains a Message Board that houses multiple forums. The Collaboration System and the Message Board are often used to create discussion forums, but the Collaborations System's flexibility lends itself to many other creative uses.
Separator macro
The Separator macro,