I was under the impression that the "back button" closes applications. Apparently this is not true. I always use the "bb" however, I've checked and found that many apps were still open. For instance: I open messages. Don't actually create one. Press "bb". Check apps and find that it is still running. So what is happening is that after a while there are a bunch of apps still running in the background. Is there a way to force close? What is the proper way to close an application then?