Can be of great time-saving help for ms-access-programmers, in the process of rolling out master database(backend) design changes to a large amount of different customers without losing all their data. it compares an upated 'master' database with older versions of customer delivered databases, and automatically updates them to the new master design by using DAO, e.g.adding new fields, indexes or upgrade to higher JET versions! works with ANY JET database from 2.X!