Move the window around by dragging the titlebar. Now, try dragging it by the the lower part of the window. When you put the mouse over the X in the upper right hand part of the window, it has a glow effect. When you move the mouse away from the X, it changes back. When you click the X, the window closes. To re-open the window, double-click the Movable Window icon. You can also change the double-click speed by moving the slider at the top of the stage.
