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Snap view rocks!
Microsoft built the ability to run and display two apps side-by-side, a feature called snap view. This is a very useful way to work with two programs together. Snap view in Windows 8 is nice enough and improvements in the upcoming Windows 8.1 make it even better.
Some Samsung Galaxy Android tablets have this capability (called multiview) but it is more limited than the Windows 8 snap view. Any two apps can be snapped together in Windows 8, even the legacy desktop, while Samsung's method only works with certain apps.