I have never downloaded or installed either v15 or v15.1. I have used X11 for several years and this week installed X16. The same page in X11's help is different, so X16 isn't showing X11's help files, and I've never had X15 or X15.1's so it can't be that, either. The screenshots I posted were from X16's help: pressing F1, then the Search tab.
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