If you don't remember much about HyperCard, or would like a few hints about how to use this stack, keep clicking on the rightΓÇôpointing arrow button at lower right.
If you want to learn more about Lisp in general or Scheme in particular, or if you are an experienced Scheme programmer and want to learn how to get started with Pixie Scheme, click on one of the named buttons at right.
Remember that you can use "Command-~" (or the corresponding item in the "Go" menu, or perhaps the "esc" key) to backtrack through the cards you have just looked at.