Originally Posted by TOM_RUS
Sorry, what? If said communication doable through addon, there's nothing wrong with it.
Also you don't need to be realid friends to transfer data between realms, regular whispers are working fine cross realm (ofc it won't work cross faction). This way you can make a list of players and send them messages cross realm without needing for specific player to be online.
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I don't think it's possible to transfer addon data through cross realms, only with your battlegroup servers.