Re: What? you mean
When WMP phones home, then it is likely to do so without going through the Tor router. This obviously reveals the public IP address you are connecting through. In a home environment that will usually equate to (or an easily determined) physical house address. Sure, it will not reveal which PC was responsible - so that's why if the activity is suspected of being illegal (e.g. drugs, kiddypron etc.) the police will bust down your door and take ALL of them for examination.