[plt-scheme] how to break and resume sandboxed evaluation multiple times?

From: DTNOIZR (dtnoizerz58 at yandex.ru)
Date: Tue May 26 16:09:41 EDT 2009

I need something that cannot work inside of current sandbox. I need to jump out from sandbox, do something and come back to sandbox with some result value.

how to do it? I try exception handling but dont understand how to break and return multiple times ...

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