Useful but little known Windows keyboard shortcuts are a sure way maximize your computer efficiency. Here are a few that I use daily. Ctrl-A selects all the items in a window. Alt-F4 will close the active program or window. Alt-Tab switches between open windows. To learn more, read Windows Keyboard Shortscuts at About.com.
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Feldman, Barbara. "Little Known Windows Keyboard Shortcuts." Surfnetkids. Feldman Publishing. 8 Jul. 2008. Web. 21 Nov. 2014. <http://www.surfnetkids.com/tech/316/little-known-windows-keyboard-shortcuts/ >.