Conclusion
D0 online event monitoring system (D0OEMS) uses an asynchronous framework to reconstruct events, calulate physical quantities, and fill histograms
User interacts with framework through a GUI which provides information and control functionalities
Features of the ROOT framework have been successfully integrated into D0OEMS
While data taking is a year away, detector component commissioning is in progress. The D0OEMS described here is being used to verify the component performances
User response will guide future improvements
Hope to provide web based access of information to remote collaborators
Joel Snow, D0 Collaboration, February 2000