Force a Stuck Application to Close
When you are working with an application, you may find that it becomes unresponsive and you cannot interact with the application or even quit the application normally. In that case, you can use an OS X feature called Force Quit to force a stuck or unresponsive application to close, which enables you to restart the application or restart your Mac.
Unfortunately, when you force an application to quit, you lose any unsaved changes in your open documents. Therefore, you should make sure the application really is stuck before forcing it to quit. See the second tip on the next page for more information.
Force a Stuck Application to Close
Click .
Click Force Quit.
The Force Quit Applications window appears. ...
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