[Zope] Why does Zope run multiple instances of z2.py by default?

Hi, I was just wondering why Zope runs multiple threads of z2.py by default? For example in my ps listing I have: zope 18183 1 0 10:25 ? 00:00:00 /home/zope/Zope/bin/python /home/zope/Zope/z2.py -u zope -f - p - zope 18184 18183 0 10:25 ? 00:00:10 /home/zope/Zope/bin/python /home/zope/Zope/z2.py -u zope -f - p - However one of my colleagues only has a single zope instance appear in his ps listing on his machine. His zope installation still runs fine. We are running Zope on Red Hat Linux 9. Does something like this make a difference? Thanks Tim Edwards Trainee Analyst Programmer Henry Walker Eltin Phone: 02 9887 6327 Fax: 02 9887 2412 Email: tim.edwards@hwe.com.au