Global Variables

Hi all. I taught myself PHP before the frenzy over register_globals. After a reasonable break from the language, I'm back for more. I'm building a site where I'll be holding a lot of variables in memory for each session. How do I do that? Apparently I can't use session_register() if register_globals is turned off. I've read a little about the consequences of writing bad scripts with register_globals on ... I'm fine with this explanation. I agree that I don't want people injecting variables into my session. What I want is for ME to be able to set variables and remember them throughout the session. How do I do that? Dan