网络协议软件的开发技术因为涉及到操作系统核心，所以大多没有公开的资料。
The technology in developing network protocol software relating to system kernels is always undocumented.
消息中间件为分布式系统中创建、发送、接收消息提供了一套可靠、通用的方法，它屏蔽了不同操作系统和网络协议的具体细节，减少了开发跨平台和网络协议软件的复杂性。
Message-oriented middleware provides a common way to create, send and receive message in distributed systems, it reduces the complexity in developing the cross platform and network protocol software.
在所有的软件和系统开发中都存在着通过语言、硬件、网络拓扑、通讯协议和底层架构等选择所带来的重要约束。
In all software and system development there are important constraints implied by the choice of languages, hardware, network topology, communications protocols and infrastructure, and so on.
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