MS-DOS, when I was younger

When I was at the Dato Arthur Tan Chess Centre on Sunday to look in at the 37th Selangor open chess tournament, I noticed this book among the many donated to the chess centre by the estate of Tan Boon Shih. Gosh, a book about mastering MS-DOS, the now obsolete Microsoft operating system that was de rigueur for many computers to function in the 1980s. I remember that even in the early 1990s, it was still hip and cool to show off your knowledge of DOS commands and especially the lesser known ones that could seemingly perform miracles on the monitor screen. The only person I know who could perhaps still remember how to use DOS is my ex-JobStreet.com colleague, Ted Targosz. As for me, I gave it up a long time ago and I don't regret it.