A Question of Fluid Variables

I need to understand these issues better. From these musings one is tempted to consider some sort of ambient object such as “the user” which most of the routines that have produced the current stack frames, are blissfully unaware of. Rees has added fluid variables to his Scheme 48. They are also included in MIT’s Scheme. Reading the MIT specs confuses me for they describe the semantics using the call style of computing model whereas Scheme actually requires the continuation passing style in order to explain the semantics of continuations. In short I don’t understand how fluid variables interact with continuations.

Even more fundamentally I can’t explain fluid variables from the perspective of Actors.

Other doubts