Chapters 3.3 and 3.4. of Scheme book are about continuations

See: https://pages.lip6.fr/Christian.Queinnec/PDF/www.pdf See: https://wayback.archive-it.org/all/20120905083130/http://double.co.nz/pdf/continuations.pdf See: https://web.archive.org/web/20100614042239/http://readscheme.org/xml-web/

continuation is an abstract representation of the control state of a computer program. A continuation implements (reifies) the program control state, i.e. the continuation is a data structure that represents the computational process at a given point in the process's execution; the created data structure can be accessed by the programming language, instead of being hidden in the runtime environment.