Some Vista testers have discovered that not only is Microsoft's new P2P technology integrated into Windows Vista, it's on by default in Beta 1. The protocol is designed to enable online user scenarios, such as mulitplayer gaming, that are not dependent on central servers to keep a service running. In its current stage of development, it is producing a kind of distributed directory of computers that are running Vista Beta 1. If the idea that your machine is making connections to other PCs around the world without your knowledge makes you uneasy, I suggest you disable the service. And don't worry, it will be off by default when Vista goes gold.