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As I mentioned elsewhere, I can a) imagine using this with dialogs to pop up hints about the particular entry widget, and b) would like the popups to respond keyboard (Tab) focus changes as well as mouse movement focus changes. Looking at the config dialog, keyboard focus and mouse focus seems to be independent and parallel systems, so I don't know how easy it would be to respond to both. In general, keyboard focus is indicated by a black dotted line ring, while mouse focus (activation) is indicated by a color change (blue on Windows), though for entry widgets, key focus in indicated by blue background while mouse focus is indicated by a cursor change.