 tokens from the input strings; it also makes sure that the string of tokens is legally formatted. It does not do any type-checking.</LI>
<LI>
Evaluator<BR>
The evaluator simplifies a token string. It does this by replacing arithmetic expressions with their results, by making function calls, by reading current values of cells, and by replacing identifiers with their values. The result is another token string; usually this string consists of a single token (a number or string).</LI>
<LI>
Formatter<BR>
The fo