write HttpHandlers or HttpModules, see Extending ASP.NET with HttpHandlers and HttpModules
http://www.devx.com/dotnet/articles/bj062102/bj062102-1.aspHTTP Modules
http://msdn.microsoft.com/msdnmag/issues/02/05/asp/asp0205.asp
http://www.devx.com/dotnet/articles/bj062102/bj062102-1.aspHTTP Modules
http://msdn.microsoft.com/msdnmag/issues/02/05/asp/asp0205.asp
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