[Zope] Getting username of last editor

Hi there, How do I get the UserName of the last user that changed an object. I just want a simple: This page was last edited by xxxxx on yyyyy on my pages. The yyyy part is easy (bobobase_modifiction_time), but so far I had no luck in getting the last user. Looked at History.py and history.dtml until my head hurt and still none the wiser! Thanks Etienne