[Doc-SIG] Missing platform information in subprocess documentation

[Aaron Bingham]

Hi,

In the Python 2.4 documentation for the subprocess.Popen class 
(http://www.python.org/doc/current/lib/node235.html), many of the 
platform differences are documented clearly.  However the preexec_fn 
keyword argument is not supported on Windows and this is not mentioned 
anywhere obvious.

Thanks,

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Aaron Bingham
Senior Software Engineer
Cenix BioScience GmbH 
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