Thank you kindly Jon, Wayne and Steve for you informative responses. You've answered all of my questions and I'll access the guzzidiag & tunepro thread, to get a full understanding of what (and how) I'm doing this. You guys are very helpful and swift to respond, much obliged.
BTW, I'm a decades long linux user (and programmer) and although I did initially use it with my Dell Latitude laptop and found GuzziDiag to work to a degree, I loaded MS Windows 10 since it seems to be the only platform that supports the PROM reader application. In the end, my only stumbling block was the connection cables. Once I purchased the recommended cables everything else ran smoothly.
I'm exceedingly grateful to this WildGuzzi community for all their support. You guys are GREAT.
Den j.