Thank you, @MM2. I’m slow, but I’m catching on. Your explanations are helping me to make sense of this. I appreciate your patience and your helpful answers. 
Guess I need to remember that I don’t have to have all of this figured out now. It can wait. Just trying to be prepared - and everything that I learn now will help me in the future. 
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I had the advantage of learning things as they evolved, over time, with Decom G4, G5, G6. I used G4, G6, but not G5.
Learned alot here and other forums. Now I just need good searching skills, to refresh what I think I learned before!
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