Linked data is stored in a central cache as AcDbData objects in the AcDbDataLinkManager object in the database. Objects which display the data (tables, for example) have a reference to the AcDbDataLinkManager object in the cache. Since the linked data is stored in a central cache, a single connection that is used by multiple entities can download shared data once and copy it for other instances. Data is downloaded only if the source file changes since the last retrieval.