[Zope] virtual hosts with ZServer

My apologies if this question has been answered before, but I couldn't figure it out from available documentation or list archives. I run a server for some student groups off a machine in my dorm and I'm teaching myself Zope (slowly). I deal with the dynamic IP address by using several *.penguinpowered.com domains. I would like to set up one or more virtual hosts such that http://host1.penguinpowered.com/ points to some folder in the Zope database. It seems this is possible using Set Access Rule and SiteRoot objects, but how? Any help is appreciated. I am now using plain zserver 2.1.6. -------------- Building highways to reduce traffic is like loosening your belt to reduce obesity.