I would like to run ISPConfig on the default web server port together with the normal web server (Apache). Is that possible? Does it mean a security threat because ISPConfig adds users etc, so any web app could add users etc? Shouldn't there be a way to let apache run as a different user in case of ISPConfig with a Virtual Host directive or something? I want to save resources by running just one web-server because my system runs on a vserver with limited memory and I've got quite a few other servers running, which I don't want to turn off. ISPConfig is not used at the moment, because I've got no commercial clients.