Phrack 72 "40th Anniversary Edition" Call for Papers
phrack.org
phrack.org
Turns out they had a modem answering the phone for remote access, and no password. My caller (and a few others) would wardial and exchange numbers. They had no idea what they were calling. My caller, who brought it down, eventually found some documentation and the "reboot" command. He had no idea what happened when he rebooted the computer until the feds came knocking on his door.
Later, I had an opportunity to meet one of the people involved in the investigation, who used the incident in a major keynote. I asked, "were you talking about the incident with [name of caller]?" He responded that "he didn't talk about investigations with minors." (Edit: Because my caller's phone was tapped, I was always afraid that I was on some kind of watch list.)