europeforvisitors - 3:58 pm on Apr 2, 2002 (gmt 0)

>>Deep linking can be prevented by technological means. You maintain sessions or cookies, or some such, and if it is not set by the home page, you redirect there.<<

The downside of doing that is that people may stop linking to you. (FWIW, I stopped linking to hotels in a major chain because the chain decided to redirect all deep links to the home page.)