IIS7 Worker process internals

Hi,

I have been trying to find out the internals of w3wp.exe for IIS7.0. I could find many posts related to IIS6.0 but not related to IIS7.0.

I want to know what classes (HttpRuntime, ApplicationManager, HttpApplication) are created and how many of them are created.

I am also interested in knowing the role of aspnet_isapi.dll.

Thanks in advance.