The phone company control systems used a bastardized version of Unix, which I wanted to learn more about. A company in Northern California called Santa Cruz Operations, or SCO, was developing a Unix-based operating system called Xenix for PCs. If I could get my hands on a copy of the source code, that would give me a chance to study the inner workings of the operating system on my own computer. From Pacific Bell, I was able to obtain SCO’s secret dial-up numbers for its computer network, and then manipulated an employee into revealing her username and changing her password to a new password that I had provided, which gave me access.