If the page is on the same domain as the forums, you will need to check for the "bbuserid" and "bbpassword" cookies and determine whether or not the user is logged in, which is basically what sessions.php of vBulletin does.
If I were, I'd either make the page vB powered (by requiring global.php), or create a vB powered page that will show the greeting and then require that page using SSI.
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