: Find the line reading PersonaName = "Player" and change it to a unique nickname for each computer (e.g., PersonaName = "Sam_PC1" , PersonaName = "Sam_PC2" ).
This is the most user-friendly method. It uses a pre-made patch (often called SmartSteamEmu or a similar launcher) to get you into the game without any complex configuration. how to play serious sam 3 multiplayer lan without steam