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The Complete Idiot's Guide® To iPad and iPhone App Development by Troy Brant

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Multitasking

So what exactly is multitasking? Multitasking gives you the ability to run multiple applications at once. Contrary to popular belief, the iPhone OS has always had multitasking. For instance, the Mail app downloads new mail messages even when the app isn’t open. Safari can stream audio from a website even after you close the app. However, for various reasons, Apple didn’t provide a way for third-party developers to use multitasking. Until now.
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DEFINITION
Multitasking is the ability to run two or more applications at once.
With multitasking, you can write a chat application that alerts the user when a new message arrives. You ...

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