[Twisted-Python] cleanup

[Joachim Boomberschloss]

Hi,

There was a discussion here recently about registering
a callback to be called prior to shutdown (using
addSystemEventTrigger), and I just wanted to ask, what
does Twisted allow before shutdown, and what gets
stopped in the middle; ex. if I want to do something
prior to shutdown that involves communication with
some server, and hence a deffered chain, how do I make
sure that it gets a chance to happen?

Thanks,

Joe.

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