Hmm, many helpful people, but it seams that I still haven't manage to make clear what I am searching for: All I want to know, is how the CGI (or, for that matter, fastcgi) wrappers (programs or what ever you'll call them) and Zope (actually the ZServer) kommunicate with each other. When starting Zope, you can define a port (socket, either domain or TCP) on which Zope (ZServer?) will listen, with the -F options (not to be confused with the HTTP port or FTP port). I must know what kind of handshaking takes place on this port. Surely someone knows ... Robert. ------------------------------------- Institut fuer Informatik tel +41 (0)61 267 14 66 Universitaet Basel fax. +41 (0)61 267 14 61 Robert Frank Klingelbergstrasse 50 Robert.Frank@unibas.ch (NeXT,MIME mail ok) CH-4056 Basel (remove any no_spam_ from my return address) Switzerland http://www.ifi.unibas.ch/~frank