Like https://en.m.wikipedia.org/wiki/Distributed_Interactive_Simulation or you mean the match-making protocol?
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I think matchmaking should be done on a per-game basis (or at least it's a different issue.)
I'm more referring to how players connect, such as having friend lists, joining those friends, and the profiles we see in and out of games.
This protocol looks interesting, and I'll have to learn more about it.
The standard protocol for friends list and "who's online" would be https://en.m.wikipedia.org/wiki/XMPP
Or Matrix.
What's the MM variant?
Pair of marines turn up with a VPN key in a diplomatic bag.
Fuckin sick! Sign me up! If only I had friends......
I sometimes use VPN software like LogMeInHamachi or Tailscale to play Minecraft multiplayer with friends over the internet.
Basically it makes your computers act as if they are on the same LAN. It should work for playing any game with LAN multiplayer support over the internet.