As a for-instance, the official paths for data files in Windows have changed. For some of these Windows OS evolutions, Microsoft created virtual paths that answer to programs that use them, but the virtual paths do not show up in Explorer. You cannot visually browse to these paths. They only answer if you specifically try to use them programmatically, such as within an older application. Is there a similar behavioral evolution in Mac?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)