

What to do when an application won't force quit See if that one works: hold down the Option key and right-click the app's icon. If you hold down Option and click on an app in the Dock, you will see an extra option for Force Quit. Right-click or Control-click on the app's icon in the Dock and choose Force Quit.

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It tells the app to stop what it's doing immediately and not to display any of the dialogs it might usually show you before it quits. Force quitting an application is a pretty drastic course of action.
