Marth/Jan, you can fix that being logged in problem. Log out, and clear TRF's cookie from your cookie bin (This works in Firefox, dunno if IE has a per-site cookie delete option). Then, don't tick the 'Keep me logged in on this computer' box next time you log in. You should be listed as a guest each time you come back to TRF then, provided all browser windows have been closed.
Or you could each get your own computer.
Or one person could use Firefox, and one use IE.
Or you could use Firefox with two user accounts, one for each of you.