[Zope] session_data Users Online?

Ahoi... Remark ahead, I know that "http" is a connectionless protocol, but does somebody know a hack to find out how many users are online in Zope!?! I cheked out the Session Modules in Products but can't find a Methode that works. For hints or a tutorial_link I'm very gratefully to you all. Oki, have a nice day and remember... Support the newbies, they are resources for the future. cYa