launching long-running processes from pycard?

I'm trying to launch a long-running process from pythoncard, and am
having trouble because it freezes up the GUI. I gather that the
solution is to spawn a thread, but I would need to pass that thread
quite a bit of information.

Is there some standard way of doing this? Maybe there's some way of
nesting a function in that subthread?

Forgive what is probably a pretty fundamental question, but I'd rather
get some advice on this than come up with some needless kludge.

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