I want to test the analytic mastery skills of this community, and I think this question will do it! Situation: I have a forum with hundreds of thousands of visitors. I was wondering if there are any ways to determine how many visits, pageviews, etc. are made by people logged in vs. not logged in. This would obviously be easy if I had some unique URL, etc. for the two groups, but unfortunately I don't. The only unique identifier is that logged in users can post and view private messages where "guests" can not. So, I'm wondering if in Google Analytics I could somehow create a group, filter, or segment of all users that had touched any of these unique "member only" pages and show what else that had done (pages visited, etc.) during that same visit / session. Hopefully that made sense. Thanks in advance for reading and for any ideas.