In the late '70s at Berkeley I was taking a programming class. I don't recall the exact class, but I remember that to do the assignments you had to log into video terminals in Cory Hall. The programming concepts were not difficult, but I simply could not get that editor to do what I wanted. It was only years later when I learned (and learned to love) vi that I realized that it was the same editor that had caused me such aggravation in college!