Cooperative mode

I`m trying to make an example of cooperative mini-game. Something like that: five people at the same time on different notebooks or tablets or smartphones should press and hold the big-red-button for a second. When the last one will press and hold it for a second, everyone of them will hear... ummm... TADAAA.

For some reason i`m sure that somebody already posted something relevant here but i had no luck to find it. Can anybody help me?

that would be really easy if they were all on the same computer, but now your getting into internet multiplayer which is a lot more complicated.

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