Thanks, that helps to explain things.

Just as an aside, in my day JCL was a more generic term used on many of the mainframes I used - ICL, CDC, Burroughs.

At the university I worked at we were wooed by IBM in the mid-1980s, who tried to sell us a machine to run VM/CMS I think. I forget what it was, but they failed. So I have no experience of IBM's JCL happily!
