Thanks, I have contacted this company (www.iscnet.co.uk) and they do sound helpful. The only problem is, they are saying that their web site is internet exploder only! Dave -- Dave Whiteley d.l.whiteley@ee.leeds.ac.uk Phone +44 (0)113 343 2059 School of Electronic and Electrical Engineering The University of Leeds. Leeds, LS2 9JT, UK