Reliable & unreliable messages over UDP. Robust message fragmentation & reassembly. P2P networking / NAT traversal. Encryption.
It's also worth adding that unlike most other components of the Steam API, SteamNetworkingMessages and SteamNetworkingSockets are open-source and can be used outside of Steam.
Maybe some people out there are still in a 90 minute game against techies and they can't push the patch yet
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