I don't see where I misused the terminology. As I recall, I said the Twin Paradox set the Earth as the preferred frame of reference, and to distinguish this from the SR frame of reference, I said setting such a reference point should probably be called a LOCAL Preferred Frame of Reference.

As to the Twin Paradox not being a Paradox, I am aware that it can be explained. The point I was trying to make is that if all motion is relative, then viewing the stay-at-home twin as the twin who is in motion is equally valid as saying the traveling twin is in motion. If this is true, and if the traveling twin comes back younger than the stay-at-home twin, then were would indeed be a paradox.

Actually, I was trying to use Preferred Frames of Reference as a lead in to the idea that gravitational fields can be viewed as Preferred Frames of Reference. I also relied on my opening statement about "IT CAN BE EXPLAINED AS ....." as a way of pointing out that there are many ways of explainig many things. It seems to me that viewing gravitational fields as preferred frames of reference CAN explain the Twin Paradox, I didn't say that it DID explain anything.

If I sound argumentive, I don't mean to be. It's difficult to discuss something in a few paragraphs that could easily take many months to clearly explain.