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FUDForum does not support true WYSIWYG editing. This , although it does have a "Rich Text" editor which makes creating messages easier. Adding true WYSIWYG does not appear to be a priority for the developers, although there are some pointers to how to add this functionality yourself.
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http://fudforum.org/forum/index.php?t=msg&goto=35104&
Detecting duplicate threads
FUDForum does not support this. I wonder how well it works in vBulletin?