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The system configuration change here refers to the change of activity life cycle caused by the switching of horizontal and vertical screens, thus causing the change of resources. In Android, system configuration changes will cause activity destruction and reconstruction, such as horizontal and vertical screen switching, but the switching time difference is too small for the user's eyes to detect. When the activity is rebuilt, just before the previous activity is destroyed, the system will call onSaveInstanceState (Bundle outState) to store various states at that time. In the new activity, Android will read the data through onRestoreInstanceState (Bundle savedInstanceState) and automatically restore to the View of the previous activity. Of course, in the activity, the developer's own code logic needs to be processed by himself.In order to prevent SYN attacks, SynAttackProtect mechanism is embedded in TCP/IP protocol stack of Win2000 system, and Win2003 system also adopts this mechanism. SynAttackProtect mechanism enables the system to handle more SYN connections by turning off some socket options, adding additional connection indications and reducing timeout time, so as to achieve the purpose of preventing SYN attacks. By default, the SynAttackProtect protection mechanism is not supported on the Win2000 operating system, and the SynAttackProtect key value needs to be increased at the following location in the registry:仙山隔云海，霞岭玉带连，据说世外有天仙……古代神话中有八位神仙：铁拐李、汉钟离、张果老、蓝采和、吕洞宾、韩湘子、何仙姑和曹国舅，人们并称为八仙。《八仙过海》根据民间传说改编而成的电视剧。据传原来的八仙也是凡人，他们是经过仙人的点化而成仙的，八位仙人就有八个成仙的故事，虽然他们的经历不同，但却有一个共同点：他们斩妖驱邪，锄恶扬善，造福人类，在世间留下了许多美丽的传说……Technology has played a primary role in this transformation. You must have them. Such as "MCSE", "LAN/WAN", "Visual Basic", "Visual C + +" and so on, are not English words. Many people are not familiar with them because the business is still very new and developing rapidly, and outsiders have no time to remember them. Don't be afraid, when you finish reading the book, you will certainly understand its meaning.The works, community topics, user comments, content or pictures uploaded by users included in this site are all personal behaviors of users. If the above content infringes your rights and interests, welcome to report the complaint. Once verified, it will be deleted immediately and this site will not assume any responsibility.