> Since you object to a command line parameter, how about an environment 
> variable? PYTHONUNATTENDED could be used in the library startup to turn 
> off any conceivable dialogue boxes and would be passed on to child 
> processes.  This could then also easily be added in the build slave 
> config script:  sys.env[PYTHONUNATTENDED] = "1"

That would work for me. I suppose test.bat would set this variable,
right?