IIS 6 server pipeline

HttpRequest from a browser was sent to the server,the Http.sys which is a kernal-mode operating system driver queue the request in a table of the relevant w3wp.exe process.
the w3wp.exe is a process of an application pool that the virtual directory(your site) is assigned to,
and tells to the http.sys to queue requests for the address of your site.
so the w3wp.exe takes the request and looks to ISAPI table that holds file extension to dll,
in a aspx/mx/ax/hx/cx... case it will call aspnet_isapi.dll which handles the request with the ASP.NET HTTP Runtime,
that returns the response.

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