What is SuperF4?
SuperF4 kills the foreground program when you press Ctrl+Alt+F4. This is different from when you press Alt+F4. Alt+F4 only asks the foreground program to exit, allowing it to decide for itself what to do. Read more...
You can also kill a process by pressing Win+F4 and then clicking the window with your mouse. You can press escape or the right mouse button to exit this mode without killing a program.