New York - Linden Lab, creators of the "Second Life" virtual world, and IBM (NYSE: IBM) announced on Tuesday a successful test of virtual world interoperability, during which avatars were "teleported" between the Second Life Preview Grid and an OpenSim virtual world server. An open standard for interoperability would allow users to cross freely from one world to another in a seamless transfer, just as they can go from one website to another on the Internet today, the companies said.