Well, I ordered the module from Nicholas Smith on Tuesday, it arrived on Wednesday afternoon, and I installed it on Thursday. Based on Marty's comment, I took the easy route and just added the wifi module as the third device in the chain and it appears to work just fine. Regardless of anything else it might do, the fact that it gives me an editable list of engines in my Legacy base makes it worth the price (found what long lost number I assigned to my TMCC crane and work caboose, and could finally easily erase the two erroneous entries I had in my list!!!). I've started to play around with the app, but it looks like I'm going to have to read the instructions - oh the horror!!!
Thanks for the help.
As for the side discussion which arose from my original question, as a admitted and qualified techno-peasant, I must say I haven't the faintest notion of what you all were talking about 
I am sure this has never been said on this forum before, but the subsequent discussion makes me VERY glad I don't have a really large layout!!!
