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This list of running apps includes both modern, Metro-style apps and apps that run on the classic Windows desktop. If you need to kill and unresponsive or unwanted program, this is the easiest place to do it.
Memorize this shortcut:
(The next best alternative is to press Ctrl+Alt+Delete and then click Task Manager.)
No matter where you are in Windows 8, that shortcut will summon this list. Click More Details to expand the Task Manager window impressively, as shown on the next page...
This is, as far as I can tell, the only classic Windows utility that will run on top of a Metro app. In fact, it's set by default to stay above other program windows—even the Start screen. To change that behavior, click the Options menu and clear the check mark next to Always On Top.
You'll notice that Metro-style apps running the background are automatically suspended. You can kill any app or close a window underneath a parent application, like either of the two web pages under Internet Explorer in this screen. Just make your selection and click End Task in the lower right corner.
Sometimes the Explorer.exe process hangs. When that happens, parts of the Windows shell can be inaccessible. In Windows 7 and earlier versions, you can select this process and click End Task, then enter Explorer in the File, Run box to restart it.
The new Windows 8 Task Manager makes itr possible to restart this process with one click. When you click Windows Explorer from the list under the Process heading, the button in the lower right corner is different from the one you see with any other process. Instead of End Task, it reads Restart. Click to kill the current Explorer.exe process and start a fresh instance.