KeyboardSelectionPolicy BOUND_TO_SELECTION vs ENABLED

Hi, could somebody provide a simple but complete explanation, and
perhaps a use case, for the usage of
KeyboardSelectionPolicy.BOUND_TO_SELECTION and
KeyboardSelectionPolicy.ENABLED?

I've looked at the code, and see a number of tickets being resolved
around this concept, but I'm still not clear of the intention and thus
usage of this concept (specially when the enumeration names seem
orthogonal: ENABLED/DISABLED vs BOUND_TO_SELECTION).

Thanks a lot

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