"One of the first things you are likely to notice when working with ASP.NET is the new file extension: ASP.NET pages use .aspx, as opposed to the .asp extension used with ASP. Additionally, when an ASP.NET page is requested, IIS hands off the request to the aspnet_wp.exe process; ASP uses asp.dll.
ASP and ASP.NET can both be used on the same Web server. That is, a Web site or Web application within a site can contain both ASP.NET pages and ASP pages. Because both ASP and ASP.NET pages can be accessed from the same Web server, you are not required to port your existing ASP pages over to ASP.NET-compatible pages."
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