IIS offers a lot of extra functionality. And on existing IIS servers, where you do not want any disruption, adding extra http.sys servers could be risky. Using extra products and setting up extra steps for something that happens in IIS on its own is a hassle I'd like to avoid. In Delphi terminology it's called "DataSnap WebBroker Server", so I was using DataSnap and WebBroker interchangeably, perhaps incorrectly. Besides, the support infrastructure seems almost all there for ISAPI, so it would be nice if you could do the last few steps to iron it out and make it available...