[racket] Retrofitting call/cc onto an interpreter not written in CPS

Hello,

I'm programming a toy interpreter for Scheme for educational purposes. It's
programmed in C, and I've got a basic interpreter with the basic forms
working as well as tail call elimination.

I'm wondering, at this point, what's the easiest way to get call/cc working?
The interpreter is not programmed in CPS.

And can someone verify whether I'm understanding continuations properly? Are
they just essentially a "label"? That is, it's just some structure that
contains the next code to execute, and the environment in which to execute
that code in?

Thanks for your help
  -Patrick
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