http://blogs.msdn.com/b/shawnfa/archive/2005/10/06/478009.aspxWhen I first talked about AppDomainManagers , I mentioned that there were three ways to set them up. You can either setup an environment block, use some registry keys, or use the unmanaged hosting API. In most of my samples so far I've used the environmenten-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)