> This concept is very well understood and is called divergence. A silent 
> action is an *action*. It does something, namely allow the process to 
> progress internally, in a way that is not observable by the environment. 
> A process that engages in an infinite set of such actions, thereby not 
> giving the environment any opportunity to influence its behavior, is 
> said to be divergent.
I thought divergence affected the whole process, and was pretty
catastrophic.  The catatonia action only affects the single thread in
which it occurred.  Or am I misremembering it?  It has been a few years
since I looked at CSP.
                                        Jeremy
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