[FONT=&]Apps go into a suspended mode when you switch to a new app. Here's how it works. When you switch away from an app it is given 5 seconds to perform any cleanup work (like saving settings or its state) and then is suspended. It is still in memory but not receiving any CPU cycles. If the system needs to free resources it will terminate suspended apps to make those resources available.[/FONT]
[FONT=&]Let’s say you have 10 suspended apps and your App History is set to 3. If resources are needed, the 7 oldest apps will be evaluated to determine which one is using the most resources. It will be terminated. The only app(s) that are running, rather than suspended or terminated, are the ones you are actively using.[/FONT]