Well, one problem here is, there will be no way for the bridge to know if a user is logged in to Vbulletin. Vbulletin uses a cookie method to check login status (as most scripts do). Site1.com can never see site2.com's cookie, ever.. That is just how browsers are built. It is a security issue. You wouldn't want site hackme.com to see your paypal.com cookie would you?
I just do not see any way you are going to be able to do it myself..
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