[Zope] How? ZServer + PCGI

I have an existing pcgi setup and want to start using ZServer as well. I just don't how to get them both running. The Zope 2 INSTALL.txt says: * You can use PCGI and an existing web server if you use ZServer. How? Do you: python w_pcgi.py or wo_pcgi.py? start ZServer with what args? The docs are a bit confusing: wo_pcgi == without pcgi ==> ZServer and ODB3 w_pcgi == with pcgi ==> without ZServer (ODB2?) Therefore how to combine ZServer and PCGI? I know ZServer has a PCGI channel. Therefore maybe the above scripts should instead be named w_zserver and wo_zserver, because you can use pcgi in either case? As you can tell, I'm totally confused here. Would someone provide an example? Thanks, Alex Rice