[Zope] hopefully a simple hook (non-html version)

[Matt]

Can't believe I sent an HTML email, sorry about that.

I was wondering if there was a simple hook into ObjecManager or something
like this that lets me know when an item in the container has been altered.
At present I have to actively mine the container for changes to bobobase
modification times of the objects it contains.  I have wrapped a small
product around Folder.Folder to allow me to do this, but would like to find
a hook that lets me know when the modification time of a contained object
has changed.

Matt