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By default, the Search menu includes every Metro app on the list, giving you the option to point a search to an app. So you can enter a term, click Internet Explorer, and have the query sent to your default search engine (Bing, unless you change it).
Because the Windows 8 Developer Preview ships with a large number of search-enabled apps, that initial search list is very cluttered. So clean it up as I've done here. Click Control Panel on the Start screen, choose Search, and then adjust the entries on the Apps list: move the slider to Off for apps you don't want to use for searches. Slide it to On for apps that you want on the list.
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.