back routine should take. The beginning section will just describe this in general terms; for example, &quot;the Evaluator uses the callback to find out the value of a cell.&quot; The advanced section provides a more detailed explanation.</P>
<P CLASS="subsectionLink">
<A HREF="#Parse_2.htm">The Scanner</A></P>
<P CLASS="subsectionLink">
<A HREF="#Parse_3.htm">The Parser</A></P>
<P CLASS="subsectionLink">
<A HREF="#Parse_4.htm">Evaluator</A></P>
<P CLASS="subsectionLink">
<A HREF="#Parse_5.htm">Formatter</A