[Zope] Can't find documentation for methods like manage_clone...

Hi, just started exploring Zope for about one day. I worked throu the tutorials in the Content Manager's Guide. For example at page 28 they use methods like manage_changeProperties or manage_clone. I assume their are more useful methods, but where are they documented? I searched for hours! Am I blind or what did I miss? Tank You Stefan E-Mail: sriegel@privat.circular.de