a function name (that is, an identifier followed by a parenthesized argument list), it does not write an identifier token. Instead, it writes a &quot;function&quot; token, which has a one-word data section. This section is the function ID (described in <A HREF="#Parse_6.htm_17673"> Parser Functions</A>
). If the function's name is not one of a built-in function, it will call the application's callback routine to find out what the function's ID number is; the evaluator will pass this ID when it needs to have