[Zope] sessionId +

Hello list, What is the information the session-IDs consists of (of course in crypted form)? Or asked in another way: What are the criteria to create a new one? I think it's something like: - browser id Here is also the question: What is in it? - user - kind of browser (e.g. netscape, ie) - client hostname - ??? - timestamp (or better: the previous session has ended) Is there a possibility to differ requests sent from different browser windows? Thanks in advance, Ulla.