One of the features in OS X is the Mission Control window management system, which will show you various views of current windows for a single application or all applications. The view for all windows for a single application is called "Expose," and as with other Mission Control features it should smoothly toggle on and off when triggered. However, there may be an odd occurrence or two where this view may get stuck and not shut off.
When this happens, it may appear that no application (including the Finder) will reactivate. While applications like iTunes may continue to … Read more