mouse scroll wheel. This works
            whether the mouse is over the primary viewer or the satellite viewer.</P>

          </BLOCKQUOTE>

          <P>The <A href="#Satellite_View">satellite viewer</A> is always zoomed out far enough to
          fit the entire graph into its window.</P>
        </BLOCKQUOTE>

        <H3><A name="Interaction_Threshold"></A>Interaction Threshold</H3>

        <BLOCKQUOTE>
          <P>While zooming out (away from the vertices) you will eventually reach a point where yo