Use the Close command to close the active window. If the
active window is a file window and has not been saved
since changes were made, you will be asked if you want
to save the file. The shortcut key is CTRL+F4.
If you have a mouse, you can close a window by clicking
in the close box in the upper-left corner of the window.
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│┌─┤◘│◄───── Click here to close
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