[messages] [Module Design] Global keyboard shortcut

[mroyer]

I did some searching but haven't spotted how to do this:

How can a button or "global" keyboard shortcut be assigned to a trait of
all pieces?

For example, I have an area of effect assigned to units with zones of
control.  A keyboard shortcut can toggle a visible shading of the area
for each piece separately.  I'd like to have a button or keyboard
shortcut (or both) to toggle on/off area-of-effect shading for all
pieces at once.

Thanks for any help,
-Mark R.

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