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A window is a rectangular area of the screen, with a title bar located at the top and a border. A window typically displays an application -- this allows you to have more than one application visible and work on multiple tasks at any given time.
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You can control the position of windows and its size on the screen:
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To move the window, simply drag the title bar to a different area of the screen.
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To resize a window, drag one of the borders to expand or contract the window. You can also drag a corner to change two sides at once. Also, you can use the window buttons to close, minimize, and maximize the window.