VirtualHostMonster, or short VHM, is usually used together with Apache's rewrite rules and proxy mode to implement virtual hosting. Unfortunately, when used in this way, Zope's REMOTE_ADDR is the (usually uninteresting) IP address of the Apache server and not the one of the browser/its proxy. There is an Apache patch that passes this IP address via an VIA header, but this is against the HTTP 1.1 spec. This VHM patch enables VHM to take the remote address from the URL. If the URL segments following the VirtualHostBase/protocol/host are VirtualHostRemoteAddr/remote_addr, then VHM sets Zope's REMOTE_ADDR to remote_addr. This feature is used together with Apache rewrite rules of the form: RewriteRule pattern http://localhost:8080/VirtualHostBase/proto/host/VirtualHostRemoteAddr/%{REMOTE_ADDR}/something [P]. For download see <http://www.dieter.handshake.de/pyprojects/zope> Dieter