In short, it's a tool designed to make it easy for homebrew developers to create games with crossplay between these platforms.
But depending on the use case, it could also make it easier for multiplayer games released on different platforms to...
So awesome! I haven't heard of this when the thread was first posted, but I'm glad I heard about it now.
In the past, I've had some ideas for homebrew/programming projects that could use this kind of functionality. But having to figure out how to...