Read the step-by-step how-to: http://www.imore.com/how-close-three-...
Multitasking got a huge boost in iOS 7. Not only did Apple expand background processing to every app — and intelligently so! — but they created an entirely new fast app switcher interface as well. Based on the cards metaphor, you can now flip through them, and even flip them away... And you can do it for up to three apps at a time!
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