MyBB Community Forums

I am currently working on a Java based web application, and would like to add forums. I need to have one signup/login/logout timer for both (essentially it needs to look like one system), even though they will need to run on separate servers. for signup and login, I figure I can have the systems communicate via http, but I'm unsure of a good way to get them to share a logout timer or even if myBB currently has one (I'd have to add one otherwise). Does anyone have any suggestions? and how difficult would the modifications to myBB be to make it support this? I'm pretty good with php, but I'm entirely unfamiliar with myBB.

Thanks in advance,
Jason