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create_window (lx, by, rx, ty, message)

     Usage: Builds an OVERLAPPING window.  The new window becomes
            the current. A buffer MUST be attached to the
            window using attach_buffer before the screen is
            refreshed (see refresh). BRIEF supports up to three
            overlapping windows. The underlying window is restored
            when the window is deleted. Minimum size is 1 line by 14
            characters.
            +--------------------------------------------------------+
            |WARNING: Hazardous to your program if incorrectly used. |
            +--------------------------------------------------------+

Parameters: Lx, by, rx, and ty .ints. are left, bottom, right and top
            edge coordinates. Upper left is (0,0), and lower right is
            determined by the screen size.  Message .string. is the
            text to put in the bottom edge of the window.  It must be
            smaller than the width-2 (rx-lx-2).

   Returns: Nothing