Not at all. From inside the GameGuru Editor, Press the white icon with the blue people on it. This will start multiplayer mode where you can join a lobby or start a host for a lobby yourself.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit