How did you learn vi?

1) vilearn
2) vimtutor
3) Documentation (faggot)
4) Other

Some years ago I logged into a UNIX system. I think it was Tru64 on Alpha.
I found one of the nicest piece of software I've ever seen. It was an interactive tutorial bound to the command help that taught you the basics of the shell interpreter, how to use [m]ed[m] and eventually introduced the C programming language.
I would really like to know what was this tutorial. A gem from the past.