Good article from Frasier Speirs regarding the mysteries of the iOS taskbar and what really happens when you background an app. I bet some developers do not understand completely what’s going on under the hood, so this is very good information.
I liked the “in a nutshell” quote below…
How iOS multitasking really works | Macworld
The iOS multitasking bar does not contain a list of all running apps. It contains a list of recently used apps. The user never has to manage background tasks on iOS.