[plt-scheme] Repl during animation or simulation

Resending:

Thank you very much for that! After RTFM, I found it there as well:
http://docs.plt-scheme.org/reference/threads.html#(part._.Creating_.Threads)<http://docs.plt-scheme.org/reference/threads.html#%28part._.Creating_.Threads%29>

http://list.cs.brown.edu/pipermail/plt-scheme/attachments/20090604/d3e3b060/gears.objis
a version of gears.ss I tried to attach to my previous post. It allows
you to do things like this at the REPL:

(send c move-left)
(send c run)

Regards,
Greg
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