I tried to google on the references today from NIck's mail - Replication no longer considered harmful - there is a real (?) paper with that subject Rob TillaartNederlandse sectie - <a href="http://arduino.cc/forum/index.php/board,77.0.html">http://arduino.cc/forum/index.php/board,77.0.html</a> -(Please do not PM for private consultancy)