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New mouse options for Start screen tiles
Many of the changes in Windows 8.1 Update 1 appear only when using a mouse. On a touchscreen device, using the tap-and-hold gesture on a Start screen still exposes options along the bottom. But if you're using a mouse, you can right-click a tile and get access to those same functions in a context-sensitive menu that doesn't require moving the mouse pointer to the bottom of the screen.
Desktop programs and Windows Store apps on the same taskbar
You'll have to look closely to see the single new option on this menu. If the option to show Windows Store apps on the taskbar is selected, you can see and pin icons for any open app on the taskbar, alongside icons for Windows desktop programs.
Previewing Windows Store apps from the taskbar
In Windows 7, music and video apps offer playback controls directly from the taskbar preview, which appears when you hover the mouse pointer over their icon. Windows 8.1 Update 1 adds this same capability to the built-in Music and Video apps, allowing you to pause playback or skip a track without leaving the desktop.