ECO allows you, if you choose, to defer all persistence operations to a custom persistence application on a shared server rather than connecting to the persistent storage directly. This central place for serving persistence requests allows the server application to automatically track which business objects have been modified since a given time, it can therefore notify each client whenever data it is using has been updated by another user, saving the client application from having to re-fetch data repeatedly in order to guarantee that the client is always looking at current data.
