How is the dictionary of a Products class object treated by BoboPOS? I'm thinking of using an existing class, which keeps an inventory of its instances (I'm sure there was a pattern name for this...) as a basis for a Product, and wonder if it is feasible. Python's std lib documentation is a little ambigous about this: First, it says "Note that when class instances are pickled, their class's code and data are not pickled along with them. Only the instance data are pickled." Later then: "The following types can be pickled: [...] - classes that are defined at the top level in a module " Can anyone light things up? Stefan