Try the following:

  install_demos
  cd demos
  load hello.p8
  run

aha, missing 'load', which isn't in the help? I tried 'run waves.pb' or whatever, but nothing.

edit: no you're right, 'load' is in the help, my mistake. But I'd still say you want to make a lesson plan of some kind.

I think an example showing all the steps in the help would be needed to get someone started. I also missed the load step.