[Zope] unique ID of object

[Tom Cameron]

I need to be able to uniquely identify a zope object by another way other
than its context and id.

I want to be able to create an object and then identify that object again
even if it has been moved in the zope tree.

I assume that each zope object must have some totally unique id that I can
call somehow.

I could write a routine that generates random ids that would be almost
unique, but I am wondering if Zope has such a feature already built in
somewhere.

Tom