"Andrew C. Greenberg" wrote:
> 
> I believe this colloquy has more than exceeded the patience and
> tolerance level of our colleagues.  I will respond to this, after
> which I would suggest instead taking this offline.

Thanks for the great discussion -- including the most recent comments
pointing out places where what I wrote may have been in error. 

I learned a lot!

-Paul Fernhout
Kurtz-Fernhout Software 
=========================================================
Developers of custom software and educational simulations
Creators of the Garden with Insight(TM) garden simulator
http://www.kurtz-fernhout.com