[Zope] name of top object in ZDB?

I'm trying to put together an External Method that needs to operate on several different objects within the ZDB (a/k/a ZODB, BoboPOS).

How do I specify an object ID and retrieve the relevant object? sorry to be obtuse, but I can't find an example anyplace. In the online docs

If I have a URL like '/manny/moe/jack', I know that from within the top-level object, I can retrieve the object 'jack' as 'manny.moe.jack'. But if the context is jack, how do I specify the top level so I can talk about manny? Wade Leftwich Okay Network Services, Ithaca NY tel 607-277-1334 fax 607-272-3612