Difference between ASP.NET Website and ASP.NET Ajax-enabled Website

What are the differences between creating a standard ASP.NET Website and a 'special' ASP.NET AJAX-enabled website?

What are the differences VS.NET 2005 does behind the scenes?

The "ASP.Net Website" creates a default web site to create webb apps. the "ASP.Net Ajax-enabled website" will use another template and create a "normal" web site but with the required settings in web.config that is needed and a Web Form that already have the scriptmanager on the page (ScriptManager is the control that kind of "handles" all the Ajax fetures on the page) and a reference to the ASP.Net Ajax assembly.

VS 2005 don't do anything spec behind the scenes, more than using different templates that I describe above.