Microsoft Spy++
Spy++ is a Win32-based utility that gives you a graphical view of the systemโs processes, threads, windows, and window messages.
Spy++ lets you perform the following tasks:
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Display a graphical tree of relationships among system objects. These include processes, threads, and windows.
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Search for specified windows, threads, processes, or messages.
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View the properties of selected windows, threads, processes, or messages.
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Select a window, thread, process, or message directly in the view.
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Use the Finder Tool to select a window by mouse pointer positioning.
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Set message options by using complex message log selection parameters.