Which way is best to execute a Python script in Excel?

Sat Jul 7 05:05:08 EDT 2012

Thanks again Emile, I'll try out some examples. I found this one: http://showmedo.com/videotutorials/video?name=2190050&fromSeriesID=219
quite enlightning. 
One last doubt is: say the python code gets used by more Excel Users (different pc), can I include in some way a dinamic generation of the id in order to allow each pc to register is own COM server or do I have to hard code the id on each machine specifically?