These applications serve to process user data and treat every request as an important unit of work with a well-defined transaction lifecycle.
这些应用程序用来处理用户的数据，并且将每一个请求都作为一个重要的带有明确事务生命周期的工作单元。
When the server process gets the request, it performs the requested work or looks up the requested data and sends back a reply.
当服务器进程得到请求消息之后，便执行所请求的工作或者检查客户所需要的数据，发送应答消息。
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