[Zope] Zope background variables

Hello, I was wondering if there is a way to store a global variable on the server, and have such variable be easily retrieved in Zope dtml/python methods. I want to make my own login system with sessions. And store session ID on the server and cookie to identify logged in users. Is there an easy way to store a list of users and session IDs on the server? Like a background array that's always available as long as the server is running. --------------------------------- Yahoo! Photos Got holiday prints? See all the ways to get quality prints in your hands ASAP.