To close an app on iPhone/iPad:

- Double click the button at the bottom with the square on it, which will bring up the list of running apps (across the bottom)
- Scroll (L/R flick) to find the relevant app
- Press and hold it
- All running app icons will start to wobble and a minus sign in a red circle will appear top left of each
- Click the minus sign on the app (or apps) you want to close
- Press the square button again to finish
- Press the square button again to return to main screen

It is easy to get a lot of apps running these days which can cause the device to become sluggish, and battery life to fall. I usually have a clear out every week or two and have peaked at about 40 apps. A friend (who didn't realise all this multi-tasking stuff had been introduced) had over 80 running as he had never closed one since upgrading to iOS4 (I think that was when it all came in).

Duncan