I've written a class called RemoteRack. It works just like a ZPatterns Rack, except that the BTree it uses internally for storing its persistent data can be anywhere else in the ZODB. I'm using it in a FileStorage-based application where I want to have the application's persistent data stored in separate FileStorage data-file than the application objects. This should allow me to upgrade the application to a new version, whilst preserving the application data, by just dropping in a new application FileStorage datafile. I intend to release RemoteRack as part of the next version of DataSkinAddons. However, I'd like a volunteer or two to test it first. Any volunteers? -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net