This paper is a description of a prototype ATM management system built to demonstrate HP OpenView DM CORBA at the 1996 Network Management Forum in Barcelona. The emphasis of the demonstration was on the features and use of the services provided by DM CORBA. The GUI for the demonstration was implemented using Java. The paper first introduces DM CORBA, then describes the implementation of the prototype management system and a simple video-on-demand service built on top of it, and finally, we offer some comments about what we learned.