Had a strange experience on RvS multiplayer this weekend. Was playing on a clanserver and one of their members typed "Hello <name>..." on the chat line, where <name> was a very old RvS screen name I used a long time ago. Apparently the guy was able to see some type of history file on my PC. It spooked me a bit; I didn't realize one's machine was open to such exploration while on multiplayer, aside from apps like punkbuster. I asked him how he was able to see that old data, but he refused to reveal how he did it. BTW I'm connected to cable modem via LinkSys router. I've got it reasonably well set up, showing no vulnerabilities using the major online security tests. This doesn't make my system bulletproof, of course, but its set up better than the average home user.
Anyone have info on this, or is it common knowledge and I've been out of the loop for a long time? Curious, and thanks in advance.