How to know a system command doesn't exist

Nicolas Fleury nid_oizo at yahoo.com_remove_the_
Wed Dec 3 17:59:08 EST 2003

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Hi,
	How can we know when using popen if the process returned 1 *or* the 
requested command is simply not found?  I'm using latest ActivePython on 
Windows.

Thx
Nicolas

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