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I have never seen a Pre first-hand, but I have read a lot of articles and seen a lot of videos. So take this for what it is worth.
On the subject of closing apps, my impression is that you absolutely do not have to close apps, and that the Pre surpasses all other mobile operating systems, and even to an extent desktop operating systems, in this regard. The Pre will virtually keep a limitless number of applications "live" on the surface. But what goes on under the surface is very different. From what I have read and seen, the Pre will checkpoint applications that were least recently used, or perhaps at the bottom of the card stack, and close them, but keep an appearance of the application alive as a card. The user can always wake the application by selecting it, and the checkpoint is used to revive the application. If I have time, I will try to find where I saw this, but I believe it was in the original CES presentation.
The point of closing applications is ONLY to clean up the desktop. It's purely for simplifying the UI, or, at best, to close applications that might use system resources or to abandon an action that is no longer necessary (e.g., you decide not to write that email after all).
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