Zope - Python Method (internal)

[Hemau]

I´m really confused!
Reading the Zope Book on www.zope.org I´m told about a product
called 'Python Method (internal)' or 'Restricted Python Methon' , which
can added like other products to a Zope-site and with which You
can add native Python Methods easily to Zope. I use Zope 2.2.2  for Win32
and I cann't find this product. Where is it?
Please help!

Hermann
hemau at aol.com