[HttpHandler]
Q308001 - HOW TO: Create an ASP.NET HTTP Handler Using Visual C# .NET
Q307997 - HOW TO: Create an ASP.NET HTTP Handler Using Visual Basic .NET

[HttpModule]
Q307996 - HOW TO: Create an ASP.NET HTTP Module Using Visual C# .NET
Q308000 - HOW TO: Create an ASP.NET HTTP Module Using Visual Basic .NET