Holding down the home key shows a list of six running/recently running apps. There are task managers in the market, I've not gotten a lot of use out of them, o

Holding down the home key shows a list of six running/recently running apps. There are task managers in the market, I've not gotten a lot of use out of them, other than to note that I should remove an app I'm no longer using any more that I wasn't aware was running. What happens when an app no longer has foreground capability is app-dependent.