CoMed is a web-based real-time collaborative medicinal system that allows medical specialist to share patient records and to communicate with each other on the Internet. CoMed consists of a multimedia object database containing relevant information about laryngeal disease and a real-time multimedia collaboration system. The latter includes a teleconferencing system, a whiteboard and chatting system, and a multi-agent system, for conference calling. We adopted the object database O2 and CORBA technologies for the multimedia database. This provides the flexibility, extensibility, and location transparency of the databases. We implemented a SeeYou Active X control for teleconferencing, and a java applet for whiteboard and chatting, as well as a session manager, which integrates the two systems of different technologies. Moreover, our multi-agent system for conference calling makes our system more advantageous by allowing the convener to minimize the effort to call a conference.