look at the example maps that come with UDK--theres one that starts you in a little garage with some vehicles. That map has an example of setting a explosion using the "E" button. If you dissect that, you should be able to figure out how to do your button trick.
Or: google some basic tutorials for "kismet". Read a couple of those to get familiar with the tool and you should get a sense of how to do what you want.
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Or: google some basic tutorials for "kismet". Read a couple of those to get familiar with the tool and you should get a sense of how to do what you want.