another session question

OK, I've got my session id and other variables all being passed now. My next question: I have an index page, which has frames. It starts the session, and passes it to each of the frames. If I run a script in one frame which registers some session variables, and then try to access them from a script in another frame later on, it doesn't seem to be getting the registered variables. I've checked my access logs so I know that the session ID is correct. Any suggestions? Thanks. Robert