Abstractly, a continuation is a representation of the state of an execution, and
especially its "execution stack" 
[http://en.wikipedia.org/wiki/Continuation].

There's a delightful article explaining continuations at [http://www.intertwingly.net/blog/2005/04/13/Continuations-for-Curmudgeons].

''[DKF] 17-Apr-2005:'' Interesting. I just wish it was easy to apply in Tcl, but our openness to extension, especially by C libraries, makes this very tricky indeed.
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[Category Concept]