(this tutorial originally appeared on the Peppermint forum, it id by mattosensei)
Have you ever been faced with a laggy, unresponsive or crashed application and program window?
It happens - though for me, much less in Linux than in Windows.
Sometimes you can't X out to close the program but you do want to close it down.
There is a very quick and easy terminal command you can use to 'point and kill' the unresponsive program. Simply open up a terminal window using CTRL+ALT+T and then type the code below and hit enter:
You will then see a X-hair appear. Just hover it over the window that's not responding and click the mouse button. Voila - the process/window/application will be killed.
Note: don't try to kill by clicking in the taskbar at the bottom of your screen as you will inadvertently kill Nemo (the desktop manager running your user interface ;))
Anyway, a handy little tool in case you're not aware of it. 8)