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A pretty nice article on netcode (and a github repo with much more)

Says it was written in 1999 by Sweeney, pretty nice historical article to really grasp some foundations with the multiplayer code UE4 uses. Found it really nice and simple, given the complexity that is UE4.

found here: https://github.com/MFatihMAR/Awesome-Game-Networking
also a really good source for network programming in general