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How can I effectively debug arcpy Python scripts?

I prefer to use PyScripter over IDLE as my IDE/debugger for writing GP scripts in Python. In ArcGIS, however, when I right-click on a geoprocessing "Tool" that references a Python script, it always opens in IDLE.

What is the best way to change the default tool that ArcGIS is calling?

Edit: I am currently running 9.3, but am transitioning to 10 soon, so suggestions for both versions is appreciated if they are different.


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