It basically is — the same format is used for both defaults (app-defaults files in traditional Xaw programs) and customizations (.Xdefaults and the "resource database"). As far as I can tell, Tk picked it up from Xrm, and there actually is an option to have Tk use Xrm but I have not looked into that yet.

In reply to Re^3: Verbose Tk Code by jcb
in thread Verbose Tk Code by LanX

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