Not sure if this is by any means useful, but here you go:
You can run more than one instance of the same Cocoa app, for example two Clock apps running under the different process id, from the command line. It is pretty simple to do:
Caveat: GUI apps are not intended to be executed by this way. If more than one instances are running, they access the same configuration files, e.g. a preferences file. So, there is a chance to corrupt these files. Do it at your own risk and just for entertainment.
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Mac OS X Hints
http://hints.macworld.com/article.php?story=2001033111113460