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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.
The Windows 8 Developer Preview edition includes its own hypervisor, which allows you to create virtual machines that can run other versions of Windows. You can install virtual copies of Windows XP, Vista, or Windows 7 for backward compatibility and testing. Or you can install a virtual copy of Windows 8 to experiment without putting your main Windows 8 installation at risk.
Hyper-V is turned off by default. To enable it, enter Features in the Search box, click Settings, and then click Turn Windows features on or off from the results list. That opens the dialog box shown here.
Click to select Hyper-V and its components, and then click OK. That installs the necessary components, and you can now use the Hyper-V Manager to create a new virtual machine or import an existing one and begin working with it.