I first encountered that method in NX CAD.

Siemens is an old company who tends to get investments right. Apple uses Siemens design software, so who knows? Perhaps Apple had influence?

Great implementation!

At the time, I was in a heavy pre-sales role and would make the help system a part of the demo. I am pretty sure everyone saw high value there.

And talk about complex, with depth, subtlety! That program demands more than mere buttons can deliver!