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DYNAMIC-WIND vs. multi-processing

I haven't read the current dynamic-wind proposal, so I really cannot
comment about the way it was done (sorry, I am a loser!), but I can
assure you that the original reason that Richard Stallman invented
dynamic-wind (in 1980 for the Scheme-81 chip) was to complement
call-with-current-continuation so that each process could have private
versions of certain fluid variables.  Without the power of
dynamic-wind we found that we could not support all of the structure
needed to build an operating system.  More details on that are
available if you want to hear them.