I would welcome being able to point an interface file at various identically structured data files with the on first window script setting the path. It would then be simple to look at archived data. It would also have application where a mobile device needs to access a local version of data when the network was not present. This can be made work with two references already but when the device gets back online you cannot switch back to the hosted data without quitting.
It would also be of use where I'm creating a software as a service solution and don't want to have to modify each master file.