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I am aware that after closing an application (pressing the home button) you can enter the multi-tasking tray, hold your finger down on an icon and close an application properly. But is there an easy way to perform this series of actions with one command? Sometimes I close an app and know I will not be using it again any time soon and would not like it to remain open in the background.

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+1, Good question, I was about to ask about this too (and about possibility to close all background apps at once, but I guess currently that isn't possible either) –  Jonik Oct 17 '10 at 19:39
    
+1 I didn't know that we can close apps on multi-tasking bar ! –  garikapati Dec 29 '10 at 17:02
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up vote 9 down vote accepted

Not presently.

iOS multitasking however is quite different than say the multitasking in Android or Mac OS X. The app unless it specifically is using one of the 7 methods to run in the background is "frozen" and won't consume any resources until it's brought back to the forefront. Essentially the fast app switching feature as part of iOS 4.0 is a large part of why you saw so many apps being updated to work with iOS 4.0 multitasking.

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Another way to put it is that it is kind of like a "history" of what apps were used. With some "multitasking" involved. Just saying :D –  Vervious Sep 10 '10 at 2:15
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It's true that with most apps it doesn't matter much. But I've noticed there are some, like Skype, that drain the battery way too much if left on the background. :-/ –  Jonik Oct 17 '10 at 19:37
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If your iPhone is jailbroken, you can set an override in Backgrounder to disable multitasking on the particular app so that when you press the home button, the app terminates (even though the icon will still show in the multitasking bar).

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