As a 13 year old longhaired wardialer in a not-so-privileged neighborhood in regular contact with a group of same, Xenix was something we commonly encountered. High schools tended to mistrust, rather than encourage computer enthusiasts, and the nearest public library only had a couple elementary books on Unix. I recall feeling like the richest man in the world when a friend got his first job as a night watchman and told me not to ask any questions about where this complete set of Xenix manuals came from. Good ole Xenix on other people's computers became where I honed my shell-scripting abilities at a time when documentation just wasn't so easy to come by.