very possible if you have an ip address you can go as far as collecting data about geographiocal location as far as address unless they are on a wireless connection, or if the person runes a dileup connection you can even collect the phone number they connect from -- if you are running any win os except something like win server 03 i dont think you can get any more detail from the ip as far as geographic location will only trace down to the city for security -- edit: open command promp in winxp and type Netstat -n to acquire your ip address and everything you are connected to