We use WinRunner as a load testing tool operating at the GUI layer as it allows us to record and playback user actions from a vast variety of user applications as if a real user had manually executed those actions. We use WinRunner in addition to LoadRunner when we want to record user experience response time. Visit mercuryinteractive.com/products/WinRunner/ for detailed information on WinRunner.
The following diagram shows how a GUI layer testing tool, such as WinRunner, operates.
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