Originally Posted by KrisKross

He wouldn't be able to see your system details unless you have something installed on your PC that provides them with that data. Many ISPs nowadays use such software to assist in troubleshooting and reduce the volume of calls they receive.

As for the system name, I know that it can be passed to the ISP and seen in DHCP logs. I'm not sure, but I guess the same could hold true for PPPoE logs.