HALP! My brain is melting. I’ve created a Project based on this Epic tutorial Blueprint Multiplayer: Project Overview | 01 | v4.11 Tutorial Series | Unreal Engine - YouTube.
It works fine via internet. MY QUESTION IS. Where (physically) list of created sessions is stored? 
To be precise. Let’s say I’ve shared my Project with 5 of my friends.
Everybody launched Project (or it could be even build version, but I’m pretty sure that doesn’t matter) on their computers. 3 of them hosted game. So I may join 3 of them.
But from what place my GameInstance picked up this list? Is it from some Steam server? lol