Document window
The Document window is the area where
Documents can be minimized, maximized, resized and moved around just like ordinary application windows. You can also arrange them by going to the Window menu and selecting one of the options: Tile Vertically, Tile Horizontally or Cascade. For more information on these options, see Menu bar.
To switch between documents, press CTRL+F6 or go to the Window menu and select a document from the list of opened items under the Arrange Icons option.