It is often assumed that client/server systems are entirely PC-based. In fact, only 43 percent of client/server systems installed in all organizations worldwide use PCs as servers. According to a recent unpublished study by Cowen and Company, a market research firm, the majority of servers are mainframes, minis, or supermicros. The use of PCs as servers is expected to decline to 40 percent in the near future, and the use of supermicros is expected to increase dramatically. Despite the fact that client/server moves some of the workload to the clients, complex systems, among them multi-function library systems with more than 30 or so users, require more processing power at the server than a PC can provide.