Rivet requires a Mac- sorry, it is not compatible with Lion and we are no longer developing it, so it will not be compatible with Lion in the future either. It needs an XBox 360 or PS3 to work. Your Mac and Xbox/PS3 must be connected via a router for Rivet to work. Unfortunately, many routers including Apple's Airport Extreme do not support UPnP, the protocol used by Rivet. Please be sure your router is compatible.