Print this out for your next gaming night:
[SteamEmu].AccountId = 12345678 (Use a different 8-digit number for each PC, e.g., PC1 = 11111111, PC2 = 22222222).PersonaName = Player1 (Change per PC).ListenPort = 27015. Keep this default.IsLan = false and change it to IsLan = true.