Ever experience application freeze in Linux? You can easily spot them because their windows are not responding and it has blank content. Non-Responding application also eats up your memory and your precious CPU cycle. Some even prevent you from running other critical applications.
But how are you going to close a non-responding application? Clicking the close button surely won’t help because the application does not response to your mouseclicks. For some people, the solution is to quit Xwindows (GNOME) session and start it again, but that would consume too much time by re-initialising the Windows Manager back.
One thing that you can do that actually can help you eliminate non-responding application is by using the ‘xkill’ application. To use it, (either in GNOME or KDE) you need to press Alt-F2, and type xkill to run the app. Your mouse will turn into something that resemble skull bone. Click on the non-responding Windows, and the windows will be forced closed.
There you go, a not so subtle solution to non-responding windows in Linux.