[plt-scheme] how to stop and resume sandbox

From: DTNOIZR (dtnoizerz58 at yandex.ru)
Date: Sun Apr 26 01:06:00 EDT 2009

work with sandboxing
I need to stop sandboxed evaluation, get some message from it, and after resume sandbox, put some message into it.
how to do this?

tryin exceptions with continuations, but when I do multiple breaks, there are error
"call-with-composable-continuation: cannot capture past continuation barrier"

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