After changing some codes in z2.py around line 381: - __builtins__.__debug__=DEBUG + os.environ['Z_DEBUG_MODE']='1' + DEBUG=1 +# __builtins__.__debug__=DEBUG I have successfully run Zope from the IDLE in debug mode, and i can use those "go, step, over, out and quit". There is no anything wrong till now. But, I can't set breakpoint in IDLE ( the current windoze version downloaded from www.python.org ). Sorry for windoze, these days I stay home preparing for exams and have only windoze :< When I right click in the source window and click "set breakpoint here", IDLE just responds with a "click" and does nothing AT ALL. en, my question is whether IDLE does NOT support breakpoint yet ? or just IDLE for windoze doesn't ? regards, lenx