I worked on framerworks like this. Heck, I built a (horrible, internal only) one once. The issue with this was that it broke direct linking to pages, or create

I worked on framerworks like this. Heck, I built a (horrible, internal only) one once. The issue with this was that it broke direct linking to pages, or created such ugly and long URLs that they were weren't "sharing" friendly. It was horrible, and cookies were (and remain) a much better solution.