1. Install an anti-virus software program to identify and remove viruses before they can cause any damage. These programs scan, or review, files that may come from floppy diskettes, the Internet, email attachments, or networks, looking for patterns of code that match patterns in the anti-virus software vendor's database of known viruses. Once detected, the software isolates and removes the virus before it can be activated.
2. Because the number of viruses is increasing all the time, it is important to keep anti-virus software up to date with information on newly identified viruses. Anti-virus software vendors are constantly updating their databases of information on viruses and making this information available to their customers via their web sites or email.
3. Do not open email from unknown recipients or messages that contain unexpected attachments. A user should delete these types of messages. As a general rule, a user should scan every email attachment for viruses before opening it, even an expected attachment as the sender may have unknowingly sent an infected file.

1. It must execute itself. It often places its own code in the path of execution of another program.
2. It must replicate itself. For example, it may replace other executable files with a copy of the virus infected file. Viruses can infect desktop computers and network servers alike.

Most viruses are purposely programmed to damage the computer by destroying programs, deleting files, or reformatting the entire hard disk. Others are not designed to do any damage, but simply to replicate themselves and make their presence known by presenting text, video, and audio messages. Although these benign viruses do not create notable problems for the computer user, but they typically take up computer memory used by legitimate programs. As a result, they often cause abnormal behavior and can result in system crashes. In addition, many viruses are bug-ridden, and these bugs may lead to system crashes and data loss. There are five recognized types of viruses: file infector viruses, boot sector viruses, master boot record viruses, polypartite viruses and macro viruses. Some viruses are called Trojan horses. Trojan horses are impostors that claim to be something desirable but, in fact, are malicious. A very important distinction between Trojan horse programs and true viruses is that they do not replicate themselves. Trojan horses contain malicious code that when triggered cause loss, or even theft, of data. For a Trojan horse to spread, users must invite these programs onto their computers; for example, by opening an email attachment or downloading and running a file from the Internet.

Worms are programs that replicate themselves from system to system without the use of a host file. This is in contrast to viruses, which requires the spreading of an infected host file. Although worms generally exist inside of other files, often Microsoft Word or Excel documents, there is a difference between how worms and viruses use the host file. Usually the worm will release a document that already has the "worm" macro inside the document. The entire document will travel from computer to computer, so the entire document should be considered the worm.

Worms are considered more dangerous because of their ability to spread rapidly through the network without any human action. In fact, a computer virus harms an individual PC and so its damage is more localized. Due to the copying nature of a worm and its capability to travel across networks the end result in most cases is that the worm consumes too much system memory or network bandwidth, causing web servers, network servers and individual computers to stop responding.

Domain names are managed under a hierarchy headed by the Internet Assigned Numbers Authority (IANA), which manages the top of the DNS tree by administrating the data in the root nameservers.

Error (1250) : Client does not support authentication protocol requested by server; consider upgrading MySQL client

If upgrading work is tedious to you or you are very reluctant to recompile the MySQL Client library, here you have the altenative solution, namely revoking SET PASSWORD and OLD_PASSWORD() function to reset the password and make it compatible with MySQL version 4.1.x or higher.

login to MySQL,

RSS的英文全称是Really Simple Syndication，是一种透过XML(eXtensible Markup Language)特性所制定的格式，让网站的管理者可以把网页内容传给订阅户。这是个有点像电子报和新闻群组(Newsgroup)的东西，但是赋予读者更大的自订能力和更丰富的资料。

将RSS技术应用在获取来源端的即时讯息是一个很重要的演进，对於使用者也可以很清楚的知道这些新闻是从何而来，以及这些资讯是否对自己是有用的。以下是RSS发展的优点：

1. 即时性(Timely)：
   对於RSS的订阅者而言，可以最快的得到最新讯息以及头条新闻。而不用被动式的去每个网站上去搜索。 

2. 具有成本效益(Cost-effective)： 
   在传输和发送的成本减少是很巨大的。如对於新闻邮件的发送提供者不需要花费太多的金费，对每个订阅者来寄信散拨讯息。  

3. 统一的标准：
   RSS有其一定的标准定义的，有提供RSS的网站都依循此标准，不但可以方便解读以及管理。 

4. RSS可整合在电子邮件： 
   透过RSS等软体可以将拿到的RSS讯息完美的转换成你的电子邮件的格式。这也意味着订阅者会依照自己的偏好来订阅，并且也可避免电子邮件的垃圾信和病毒。 

5. 隐私性和安全性： 
   对於订阅者而言，并不需要提供自己的电子信箱；而发行者并不能利用电子邮件重复不断的寄广告信或是垃圾信件。RSS代表着不能不正当地使用网路来作为广播媒体传送相同的讯息给大量未要求传送讯息的使用者的人，对於订阅者而言是另外一种的安全以及隐私。

RSS 要怎么使用？

RSS只是一个格式，使用者想要订阅各网站所提供的内容还需要一个阅读器(Reader)，而目前网路可以找到的桌面RSS Reader大概可以分为几种，一种是不需要微软的.NET Framework runtime version 1.0，一种需要，还有一种是其他程式的外挂套件。

如何订阅RSS资讯？  

1. 安装 微软 .NET Framework 
2. 下载免费的RSS阅读软体
   SharpReader 0.9.5.1 免费 (推荐，较简单)
   RssReader 1.0.91.0 beta 免费 
3. 安装您所下载的RSS阅读软体  
4. 选择您所要订阅的内容。当您浏览某网站时，看到或，又或者是的图标则表示该网站有提供RSS的订阅，您可以点击它，然后将其弹跳出来的网址拷贝至您安装在电脑上的RSS Reader即可订阅。

请点击这里参阅英文版本解说。