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When this is running, what happens if you hit Control-c a few times, 
especially in the first few seconds? Does it abort with a 
KeyboardInterrupt? Does it stop responding to Control-c after the window 
fills up?
Note that IDLE slows down when very large quantities of text are printed 
to the shell window. This is an issue with the Tk library.
The subprocess is supposed to exit when it notices that the socket has 
closed. This doesn't work well on Windows, unfortunately. We are 
thinking about it ;-)
It doesn't seem that what you are attempting to fix has any realistic 
application.
I don't run Vista. Check your resources right after you start your 
code. Is your system unresponsive because you are running out of memory 
or because you are using CPU 100%?
Patient: My head hurts when I bang it against a wall.
Doctor: So, don't do that!