What mean debugging with IntelliTrace? Visual Studio 2010 Ultimate know the answer, because topic applies to Visual Studio 2010 Ultimate only.

IntelliTrace extends and enhances the Visual Studio live debugging experience that you are used to You still have access to all the Visual Studio debugger features that you are familiar withIntelliTrace operates invisibly in the background, recording debug information.

When you want to look back at a past state of your application.
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