The role of the Internet today cannot be overestimated. It has become a part of our culture. Children learn how to use the Internet at school. Millions of people start their day by checking the e-mail messages. Internet connectivity is not considered as something extraordinary anymore. People use the Internet every day, as they have been using cars or TV sets for decades. More and more devices become connected to the Internet. These are not limited to servers and personal computers anymore. Electronic organizers, cellular phones, TV sets, and many other types of equipment come with the Internet applications. Digital video cameras and phones are connected to the Internet to instantly cast data to remote users around the globe. ...

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