A ROOT-based Client-Server Event Display for the ZEUS Experiment

A new event visualization tool for the ZEUS experiment is nearing completion, which will provide the functionality required by the new detector components implemented during the recently achieved HERA luminosity upgrade. The new design is centered around a client-server concept, which allows to obtain random access to the ZEUS central event store as well as to events taken online via the HTTP protocol, even from remote locations. The client is a lightweight C++ application, and the ROOT system is used as underlying toolkit. Particular attention has been given to a smooth integration of 3-dimensional and layered 2-dimensional visualizations. The functionality of server and client application with its graphical user interface are presented.