[Zope] Newbie question: HTTP variables

I'm trying to figure out Zope (on a time crunch, too), and I'm wondering how to do something. How can I access HTTP variables in my DTML code? Specifically, I want to return code specific to the user's browser. I know that HTTP has provisions for determing browser version, are those accessible in DTML and how? If they are not accessible in DTML, is there a workaround (without oodles of javascript)? Another quick question: I see that Zope 2.3 will have "Script" objects. What's the closest I can come in Zope 2.2.5? Thanks, Michael