Thanks, guess I misunderstood--I thought "pythonw" _was_ IDLE. Now I see what IDLE is, and I wasn't actually wanting to run that.
And as it turns out, my _real_ problem was that my path was making me run the CygWin version of Python from the "DOS" command prompt--which understandably dies with a "CPU" error. Now I'm squared away--thanks for the tip! -- http://mail.python.org/mailman/listinfo/python-list