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On personal computers, there are five most commonly used operating systems: DOS, Windows, Unix/Xenix, and OS/2. DOS System-In the 17 years since its inception in 1981, DOS has undergone 7 major version upgrades, from version 1.0 to version 7.0 now, continuously improving and perfecting. Windows System-Windows is the first generation of window visual interface published by Microsoft in November 1985, which makes PC enter the so-called GUI (Graphical User Interface) stage. Unix system. Unix systems were initially used on small and medium-sized computers. Unix is a multi-user system, which generally requires more than 8M of memory and a large capacity of hard disk. Linux system-Linux is the largest free software in the world at present. It is an operating system with functions comparable to UNIX and Windows and has complete network functions.7. Decorator)八月十五，中秋之夜。五大派掌门弟子离奇暴毙。盗帅楚留香不意卷入其中，被近珥五大掌门约定三月之内找出真凶。正当楚留香追查神秘人——影子之际，其红颜知己沈无心竟然成为受怀疑的对象，更由此引聘段二十年前的武林秘事。另一方面，沈无心之兄长地藏王秦震一统江湖的大业却己悄悄展开今儿若是被她打一巴掌，往后别想在京城抬起头来。任何事情的来龙去脉，安排解决都会更加的周详全面。名模特儿JUDY与男友在寓所内被凶手潜入所杀，被儿子念子看到，难被凶手察觉，但幸运地逃出，总督察程曦与助手铁男接手侦察此案。在得到林之帮助后，得知JUDY生前曾与模特儿ELLEN共住，但ELLEN与他们不合作……