sion, call <CODE>
ParserEvalExpression()</CODE>
. This routine is passed a token sequence; it evaluates it and writes the resulting token sequence to a passed buffer. It calls a supplied callback routine to perform the following tasks:</P>
<UL>
<LI>
Return the value of a specified cell</LI>
<LI>
Return the value associated with a given identifier, specified by ID number</LI>
<LI>
Evaluate an external function, given the arguments and the function ID number</LI>
</UL>
<P>
The evaluator produces a sequence tw