To write distributed applications, programmers must learn and use a large variety of lower-level libraries for cross-tier communication, data marshaling, synchronization, and security.
要编写分布式应用，程序员必须学习和使用针对跨层通信、数据编制、同步和安全等领域的底层类库。
Cohesion is especially important in n-tier applications where more than one server processes data.
在一个由多个服务器处理数据的n层应用程序中，聚合非常重要。
These step-by-step topics cover common data scenarios for client and middle tier applications.
这些逐步解说主题涵盖了用户端和中介层应用程序的常见资料案例。
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