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People around the world access the Internet on one of two main modalities. The traditionally well established one, in universities, companies, research institutes, and in mid to large size organisations, through local area networks and servers that act as gateways to the external world. The more recent modality, and the one that is growing very fast is that of people accessing from their homes through normal telephone lines, with the help of an Internet service provider. In the first case, the end user is spared most of the often complicated technicalities involved in getting connected to Internet, and can concentrate on the contents he is interested in for his professional purposes. In the case of organisations, the main computers and networks are well structured and managed by specialists that take care of keeping the systems running, developing new applications and services, providing support to users and similar functions. On the other hand, the user at home, even if skilled in technical matters may have to cope with the possible difficulties arising from connecting to Internet, alone and without much of expert support.
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