Watch The Multitasking Capabilities Of iPhone 4.0

How do you tell something to 'background' and start one of your other not already running apps from the home screen? Pressing home normally closes an app?

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Iphone os 4.0 does not have multitasking. it pauses certain apps that Apple allows to be paused and then you can un pause them by double tapping the home key and pressing on that allowed app. Only works for a few apps that are allowed.