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分析了分布式操作系统下的客户／服务器编程模型的原理，并通过分析在ＱＮＸ多任务实时操作系统下的一个在线聊天程序Ｃｈａｔ，介绍了利用该模型进行应用软件设计的方法。
This paper analyzes the principle of client / server programming model under distributed operating system and introduces a method to design application software by analyzing Chat, an online chat program under QNX multi-tasking real-time operating system.