Don Box writes some HTTP.SYS code
Don Box is playing with HTTP.SYS via the new Whidbey managed framework on Windows XP SP2. If you are really sharp looking at the service dependencies, you will find our first user on XP SP2 is UPnP. Don does mention the problem about coexistence of IIS5 (or any other app) and HTTP.SYS on port 80/443; but doesn't mention the one work around we have in place right now. The IP Listen List lets an administrator limit HTTP.SYS to specific interfaces, letting that other conflicting app work in coexistence. It's not as ideal as sharing based on the namespace, but its better then nothing.