Testing an ASP.NET application on an XP box can be a royal pain in the ass sometimes (Ok, most of the time). It’s version of IIS is the idiot brother of the IIS that comes with Windows Server. It only supports a single site. That’s kind of annoying, but doesn’t impact the stuff that I work on. The true joy of XP’s IIS is the limit of 10 concurrent connections. I’ve hit that wall before. The Coding Horror has some tips on how to bypass that limitation