Also, isn't there a higher risk of loosing all user prefs if they are on a server temps dir ?

I mean with cookies, each user is responsible for its own settings (cookkie in his browser dir), but with sessions, all is on our server==> higher risk ?

Something I don't understand: will the user profile be stored in the session ? Or will we have still the user database+ the sessions ?
Are the sessions like cookies, but stored on our server ?

I don't get it.

Thanks,
Benj