Dear Robert Purves, dear Derek Smith, in response to your helpful comments and reports of experience (messages 24949 and 24951) I should like to thank you very much. I also should like to mention that I never doubted that this fascinating approach is working -- the demo of Robert Purves is highly convincing -- but, as Alain Pastor has put it in the same digest, that sometimes there is a lack of documentation or at least, the FB^3 documentation is not sufficiently up-to-date. I'm aware of the fact that here we aren't dealing with fundamental FB^3 rules but with an sophisticated approach that nevertheless deserves being mentioned, at least in a footnote of the FB^3 manual... At present the documentation of the "DEF FN USING <address> statement" is not at all encouraging to even think about the FastFN approach that I consider highly useful! Thanks again! Best, Herbie ************************** H.Glu@...