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We know that computers can be used for work, study, entertainment, etc. In addition to the necessary computer hardware, software is also needed. Usually, we call a computer with only hardware but no software "bare metal", which cannot do any meaningful work. At present, software can be divided into two categories according to its use: system software and application software. System software is a program designed for computer systems to efficiently use and manage computer software and hardware resources and support the operation of application software. Such as operating systems, programming languages and language processing programs, network system software, system service programs, etc. Among them, Windows operating system is what we often use. Application software is a variety of programs that are user-oriented and written to solve practical problems. It can be written by users themselves or purchased. For example, office XP, Photoshop, Red Alert and so on, which we often use.People have studied SYN attack prevention technology earlier. To sum up, there are mainly two categories, one is through firewall, router and other filter gateway protection, the other is through strengthening TCP/IP protocol stack protection. However, it must be clear that SYN attacks cannot be completely prevented. What we have done is to reduce the harm of SYN attacks as much as possible unless TCP protocol is redesigned.黄蝴蝶（邵美琪 饰）是一个失意的编剧，几经波折，已经堕落到向闺蜜阿娟（毛舜筠 饰）探讨三级片的程度。胡蝶的邻居警官吕奇（梁家辉 饰）对她颇有好感，后者在英雄救美后意外得到了她家的钥匙，然而他的不请自来，却落得狼狈而逃。因为事业接连遭受重创，胡蝶决定在江边横刀自尽，然而怯懦 的她终于没有自裁，反而盲打误撞惊扰了一对偷情的鸳鸯。后者仓皇逃窜，却遗留了一些私人财物。为了物归原主，胡蝶和阿娟一同登门，却无意中卷入了一场黑吃黑的血案。侥幸逃生的胡蝶临走前，还多事地留下了黑玫瑰的字条，而阿娟却因为留下了手印而被警方对号入座。结果，黑玫瑰成为了全城热议的话题，而这也引起了黑玫瑰掌门人（冯宝宝 饰）与师姐（黄韵诗 饰）的注意，于是一场剪不断理还乱的情场争夺战开始上演了……哈哈哈哈。Yellow: turmeric, pomegranate, coptis, dandelion, etc