continuation-passing

Is MapReduce one form of Continuation-Passing Style (CPS)?

As the title says. I was reading Yet Another Language Geek: Continuation-Passing Style and I was sort of wondering if MapReduce can be categorized as one form of Continuation-Passing Style aka CPS. I am also wondering how can CPS utilise more than one computer to perform complex computation. Maybe CPS makes it easier to work with Actor...

Is it possible to implement coroutines using only LISP primitives?

First, I'm a LISP newbie. What I want to get is a cooperative micro-threading feature. And this can be gained with coroutine. As I know, Scheme supports coroutines via continuations. However, not all Scheme implementation may have continuations. If so, can I add a continuation feature with only LISP primitives? ...