In the case of Image Web Server - 600 clients can be requesting maps, from a repository of 500GB+ of imagery - and all get sub-1 second response times. In fact, the number of clients can grow into the thousands before the response time begins to go over the 1 second mark. The server hardware: A dual Xeon CPU, 2GB of RAM and SATA discs (7200 RPM). So, your typical entry level server. In fact, maybe now it might be lower than entry level.......