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There are two kinds of servers.  Those which process one request at a time
are called "iterative servers".  Those which simultaneously service
multiple requests (often by spawning a process to handle each request) are
called "concurrent servers".  Iterative servers are generally easier to
write, but are only suitable for services which can be handled quickly
and/or will not be accessed by multiple clients.  Applications which use
connectionless protocols (UDP) frequently have iterative servers, while
applications with connection-oriented protocols (TCP) usually have
concurrent servers.