- Underline the operand if it has a non-primary reference (i.e. there
          is no visible evidence that the operand has a reference.)</LI>

          <LI><I>All</I> - Underline the operand if it has any references.</LI>

          <LI><I>None</I> - Do not display any underlines.</LI>
        </UL>

        <BLOCKQUOTE>
          <P><IMG src="help/shared/note.png" border="0"> You can change the color of the underline
          from the <I><A href="#Listing_Display">Listing Display</A></I> options panel; 