The show logic and the affair handling are put in client end, data
handling logic and database are put in server end. Client end carry out front function, and server
end holds conducted backstage support to service. Since the task of customer end is heavier
than the task of server, the pattern of C/S is actually "the fat client computer/ thin server"
pattern. This kind of pattern is fit for the local area network environment, which is
small-scale, user few, unitary database and safety.