N token on the Operator stack. The evaluator FUNCTION token contains the function ID and the number of arguments to the function (starting at zero).</DD>
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CLOSE_FUNCTION</DT><DD>
Call function on top of Operator stack, passing it the pointer to the Argument stack and the number of arguments to the function call. (The arguments will be on the top of the argument stack.) The function should pop the arguments off the Argument stack, then push the return value (or error code) on the Argument stack.</DD>
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