A tree navigator is available to help you move easily to other parts of
     the tree.  Click on the box in the lower right corner of the main
     display to bring up the tree navigator.  It will show you where you are
     in relation to the rest of the tree.  You can change position in the
     tree by dragging the viewer to the area you wish to view.  To dismiss
     the navigator display, click on the lower right corner of the main
     display again.

     Alternatively, you may use the scroll bars to move through a tree-style
     display.  Whenever you drag a scroll bar, a navigator box will appear to
     indicate where you are in relation to the rest of the tree.