[takikawa]

Probably the best way to learn what an evaluation context is to read the book you've linked to there. Alternatively, it's basically what the Racket reference section on the evaluation model calls a "continuation": http://docs.racket-lang.org/reference/eval-model.html

We do try hard to make the docs understandable though, so if you have some feedback please do mention it on the mailing list so that the responsible devs can try to address it.

[akkartik]

Thanks for the tip! Continuations, I know what those are.

Yes, part of what makes racket awesome is that it has a coherent design while fluidly integrating feedback. The challenge for me is to learn some aspect of it to the point where I can give constructive feedback. Sometimes I end up giving up before I get to that point. Perhaps the tower of concepts just has to be this high, and I need to just suck it up and give it more time/priority.