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It uses the multiprocessing package, which is new in Python 2.6. From the docs:

The multiprocessing package offers both local and remote concurrency, effectively side-stepping the Global Interpreter Lock by using subprocesses instead of threads. http://docs.python.org/library/multiprocessing.html

multiprocessing is also available in 2.5, which is what I used, just do: easy_install multiprocessing

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