a better alternative to this is to use the process manager, which is done by doing ctrl+esc. then this will show a process manager window. In here, you can search for the name of the app (for ex. amarok, firefox) , then it'll dislpay the detials, wherein you can just click to highlight and click on "kill" to shut it of . Why it is better? it might be not as quick as using the skull to kill an app, but you wil not be at the risk of clicking the desktop itself, whcih would result to killng yoru desktop. Sometimes, using the skull can be tricky, like for example a delayed response, and you will have a tendency of clicking again, which will then result to killing your desktop.
Another nice item instead of using the kill command from the CLI is to do cntrl +alt +esc. This results in the cursor changing to a skull and crossbones, at least in KDE, then you can just click on the app and kill it if it is not responding.
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