integrating chatroom into vbulletin type posts is exactly what you want. That is the point, you have to be registered to use the page. In your case just make this an page about your chat room that contains the link to your chatroom. It would be much better if you could embed the java chat in that page but if this is not possible then what i have said is your best bet. Remember of course, that if someone just clicking a link is what you want to activate the tracking that after x minutes their session will time out and they may still be in chat or worse they may have left the chat room and there session is still valid saying they are there.