The Wii U is addressing the question of how a secondary smaller screen could be used in conjunction with a larger screen to play interactive games. This is a very good question, one that I have thought about for the better part of 10 years. Sony made some interesting attempts at this concept with their PSP and its connection to the PS3.
The big picture concept is that many games could benefit from the addition of a second screen allowing a player to utilize as a part of the game experience. An example would be with a racing game, being able to use the second screen to view your rear view mirror. Or during a game like Splinter Cell having the ability to use the second screen for your gadgets that let you see under doors or stick video cameras to the wall.
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