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The Force Quit button allows you to click on a window to force an application to quit. This button is useful if you want to terminate an application that does not respond to your commands, if the application has frozen or crashed, for example.

To add a Force Quit button to a panel, right-click on any vacant space on the panel. Choose Add to Panel, then choose Force Quit from the Add to Panel dialog. See Seção 4.3.2 ― Adicionando um Objeto ao Painel for more on this.

To terminate an application, click on the Force Quit button, then click on a window from the application that you want to terminate. If you do not want to terminate an application after you have clicked on the Force Quit button, press Esc.