[Twisted-Python] "installing" Twisted?

[Frantisek Fuka]

What exactly is the difference between running "python setup.py" and 
just copying the twisted/ directory to site-packages/ directory? I tried 
installing Twisted on old server which has Python 2.2 - the first method 
didn't work, the second did.

-- 
                                          Frantisek Fuka
(yes, that IS my real name)
(and it's pronounced "Fran-tjee-shek Foo-kah")
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