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Every Metro-style app has access to a full range of system services, including the ability to pick files from a screen that looks like no Windows dialog box you’ve seen before.
One place where the old desktop occasionally intrudes into the new, modern shell is with the appearance of the restyled task manager. Clicking its icon on the Start screen pops up a simple list of running apps, with an End Task button you can use to kill a program that isn’t responding.
Clicking the More Details arrow at the bottom displays an expanded Task Manager, similar to the one shown here. The additional details on the Processes tab, for example, allow you to see at a glance whether an individual app is using a disproportionate amount of memory, CPU resources, or network bandwidth. The App History tab provides a historical view of the same data.