This permits windowing (zooming) out to display a larger portion of the grid than is currently displayed, that is, to reverse the effects of one or more IN operations and so restore one of the less magnified views shown on the way to the present display. When OUT is selected with the mouse, a message of the form :
appears. The integer shown ( 2 in this example ) is a reminder of how many levels down (into) the present display is from the initial display of the whole grid.