When I go to a forum thread (none specifically), and without entering anything into the Comment section click the "Post Options" button, you get an error that (obviously) says the following:
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The following errors occured:
body: Post too short, the current minimum character count is 10.
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When I do this on a ie. wallpaper page and press the same button, you get a msgbox saying "Minimum amount of characters is 25."
One would expect almost the same function being used here though...