Here's how you can snap apps in Windows 8. This lets you use two apps at the same time. Snap apps via touch: 1. Slide your finger in from the left edge to open the second app. 2. Drag that app to the left or right side until an opening appears behind it. Snap apps via a mouse: 1. Move your cursor to the upper-left corner until your second app appears. 2. Drag the app to the left or right side of the screen until an opening appears behind it.
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Windows 8 Tips | Microsoft