(A server is a general term for a computer that specializes in managing and using the system. In terms of the number of managers included, the servers are divided into single-way servers, dual-way servers, four-way servers, 8-way servers, etc., among which more than 4-way servers are collectively referred to as multi-way servers; from the manager structure, the servers include RISC servers and X86 servers are generally referred to as PC servers based on X86 servers.)