[Zope] persistence of unpicklable objects

[KevinL]

Is there any easy way to make unpicklable objects created by a python
product, persist across product refreshes?  When a product is refreshed,
it appears that every object the product provides gets re-instantiated -
I'm having trouble finding somewhere to stash a reference to the
unpicklable object (lists used to communicate with an extra thread
holding another object - long story) that doesn't get trashed by a
product refresh.

KevinL