iOS 7 Preview: Smarter Multitasking
Apple introduced multitasking in 2010 with the release of iOS 4. However, Apple was quite concerned about the impact it could have on battery life, so it allowed only select kinds of apps to do multitasking such as apps that play audible content, keep users informed of their location at all times, Newsstand apps and apps that receive regular updates from external accessories.
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