Source : Free On-Line Dictionary of Computing

Continuation Passing Style
     
        (CPS) A semantically clean language with continuations used as
        an intermediate language for {Scheme} and the {SML/NJ}
        {compiler}.
     
        ["Rabbit: A Compiler for Scheme", G.L. Steele, AI-TR-474, MIT
        (May 1978)].
     
        ["Compiling With Continuations", A. Appel, Cambridge U Press
        1992].

continuation passing style
     
         (CPS) A style of programming in which every user
        function f takes an extra argument c known as a continuation.
        Whenever f would normally return a result r to its caller, it
        instead returns the result of applying the continuation to r.
        The continuation thus represents the whole of the rest of the
        computation.  Some examples:
     
         normal (direct style)    -->	continuation passing
     
         square x = x * x		square x k = k (x*x)
     
         g (square 23)			square 23 g
     
         (square 3) + 1			square 3 ( \ s . s+1 )
     
        (1995-04-04)