Control multiple devices with one button or slider

Is it possible to control multiple devices with one button or slider. Say for instance I have 3 outside lights at different locations, each with their own esp8266 connected. I would like to be able to dim all 3 simultaneously or switch them on and off simultaneously. Is this possible? If so how would you do it?

http://docs.blynk.cc/#blynk-main-operations-control-of-multiple-devices-tags

Thanks Dimitriy. I suppose RTFM (Read The Fu… Manual) applies here. Thanks for the quick response.

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Funny? Lol, Just kidding… :blush:

A post was split to a new topic: Can I have both individual buttons and the tagged button?