[messages] [Module Design] How to have a global property change based on card count

[barbanera]

Presumably the change in the second gp (let's call it A) is triggered by
some move or command executed by some player, correct? After all there
is no other way things change in Vassal (no background processes, no
time related triggers etc), afaik.

Then just add a trigger on that piece to prompt users for the value of
the other gp (B) when has reached the threshold value..?

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