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I have seen new links added to the main menu to outside links as a module. I think it is being used as a one page module with a redirect. I am not sure of this though. But I have seen it used for phpbb forums and before your actually connected to the forum it shows a redirect page. And when it is used as a module you can control permissions to the link. I have asked someone using such a module and I will come back as soon as I find out and post my findings. Until then if anyone knows the mod that I'm talking about or a similar one I myself would like to know.