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there's a two way to close app on windows 8. 1st one is right click on task bar and click on task manager
and you'll see app list and then right click on a app and chose end task.
2nd and the best is move your mouse to the down left corner and then move a little up and you'll see app list on the left side and right click on a app and chose close app :) hope u guy enjoy :)
Sorry for my bad english :)