iOS 4.0 (formerly known as iPhone OS) has a number of changes that enable you to do multitasking with certain features of your apps. The idea is to make your use of apps more intuitive and to allow you to pick up where you last left off, rather than having apps close down on you when you switch to another one. For example, you should be able to answer an SMS or call, keep a chat with a friend going and switch back to a suspended game when you're done. Or, you can click on an internet link in a mail you're reading and instead of closing your mail, it will simply take you to the internet link while leaving your mail open for switching back to once you're finished with the internet. Apps are now viewed as "running" or "suspended", dependent on how much the memory of the iPhone can hold. While not "true" multitasking (as that would chew up the batteries), the applications are paused while some items such as music and ability to receive calls continue "running in the background". Here is how to do multitasking using the iPhone or iPod Touch.
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