Passing Variables

I have been searching for an answer to this for a couple of hours now and cant find anything. I believe that there is a secure way of doing this but I think my brain is having a momentary lapse... I have these variables: $eventid = "1"; $age = "15"; Is there a way to pass these variables to the next page so I can continue using them without doing something like this: <A HREF="test.php?eventid=1&age=15"> I would rather not have the variables be seen or known to the end user for security reasons because they could change them in the URL. I know it has something to do with $_GET and $_POST because I do have register_globals set to OFF in my php file and I do not want to turn them on.... TIA