Ah! Thank you, Andrew, for the good, clear answer that clears up the mystery for me.
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I am in the process of trying several APRS related projects, mostly using my MacBook. I was moving and reinstalling programs, including YAAC. I couldn't figure out where it was storing and getting configuration info for which I couldn't find files. I'm not all that familiar with how Java does things, so I wasn't thinking in that direction.
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Again, I appreciate your very courteous and helpful answers to my curiosity questions.
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Pascal AC7N