Migrations and expansions of information systems are constantly at the front line of all the computer science problems to be overcome in medical / health informatics systems. It is shown here that one effective way to open the communication between heterogeneous systems is depending upon the ease of putting all the systems at work together using the middleware level to facilitate the interconnection between heterogeneous applications. However the most difficult application to migrate is certainly the ADT. It is shown here how the Pilot could facilitate the migration of applications namely with the migration of the ADT itself from a centralized platform to a full scale distributed system. Indeed the Pilot has been developed up to the stage of a pre-product and is on sale already. It has been experienced satisfactorily and is presented here.