Version 3 of MDID is completely redesigned and re-coded from the ground up in order to meet emerging user expectations, such as support for audio and video, integration with Blackboard and other web sites, more flexible metadata structures, a richer and more robust discovery interface, granular access controls, PowerPoint compatibility, shorter development cycles, support for composite objects, and novel presentation mechanisms. It runs on most operating systems. MDID3 ships with a companion application, the MediaViewer. The MediaViewer is used primarily in mediated classrooms to display slideshows (groups of ordered images). It features intuitive zoom and pan controls, intelligent navigation, image caching, catalog data display, and support for dual monitors.