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Feb 7, 2012
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It depends. Partially vanilla game already have this functionality. When standard on_action events happen (those little notifications on the right side of the screen) you can right click on the little notification and new window will pop up in the upper left corner to give you some options to either pause the game, make it "important", secondary or turn the whole notification off. For example, when ninja attack occurs game pauses by default.

If it's some other user custom scripted event, i don't know if you can make it pause the game like that.