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create_tiled_window (lx, by, rx, ty, buffer_id)

     Usage: Builds tiled windows.  DANGER: this only works after
            display_windows(0) and before display_windows(1). The
            windows created must fill the screen and leave no blank
            space. See the manual and display_windows for more detail.
            This is used by the restore macro to restore the window
            layout.
            +--------------------------------------------------------+
            |WARNING: Hazardous to your program if incorrectly used. |
            +--------------------------------------------------------+

Parameters: Lx, by, rx, and ty .ints. are then left, bottom, right
            and top boundaries of the window. This does NOT include
            the borders!  Upper left corner is (0,0), and lower right
            is determined by the screen size. Use window coordinates
            for borders ON, even if borders are off when created.

   Returns: Window ID if successful, 0 for failure