You can fix a Mac stuck in Expose without needing to force-restart your system.
Apple's Expose view can be invoked directly from the Dock, showing you the windows of open applications regardless of which program is currently in focus.
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Apple provides a default Expose transition speed that is suitable for most people, but it can be altered if needed.
The option to view all windows onscreen in Expose is back as a system preferences option.
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Brian Tong shows us all the bells and whistles of Dock Expose in Mac OS X Snow Leopard.
The utility "MainMenu" may cause Expose to display a blue background behind a phantom window.