Jim thank you so much for this! I was aware of the links that you gave with all the lists. What I was having trouble with was just the bare definitions that you so clearly described. At least to my reading, the website lists didn't give such straight forward definitions. Thank you for helping me!

So the last part of my question is the bit about a user here stating that he used DORA.sty to create a song. I take it from your comments this might be a "style", but designated by a file name that BIAB uses? The chat folks couldn't tell me where I could find out about a ".sty file" and see how it translated to their published lists of sets of RealTracks

Can you educate me on this type of nomenclature?

You were very clear above - how nice of you!!