[Zope] Object history: need last editor

Are there any hooks in the Zope API which can be accessed from a Python script to obtain object history information? I want to obtain the last editor of an object (as displayed in the History and Undo panels) but I can't figure out how to obtain it in Zope 2.5.1. If there's a way, it appears to be undocumented. I took a look at History.py but it looks like the object history is stored in an unexposed property. Any ideas? -- Michael S. Fischer / michael at dynamine.net / +1 650-533-4684 Lead Hacketeer, Dynamine Consulting, Silicon Valley, CA