We don't really have hard and fast rules per se, but we do prefer that the same message only get posted in a single place, mainly to avoid having split discussions of the same topic. Gets real confusing for simple folk like me otherwise.
Anyone wanting to respond to hello's last post here (I'm sure he just wanted to make sure that Derek saw his question), please do it in the thread that MikeF74 linked to -- there's already a discussion going there.