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Computers as a means of communication between people

If one computer with at least two people, they have a desire to use this computer to exchange information with each other. On larger machines, enjoyed by dozens or even hundreds of people, for the special programs that allow users to send messages to each other, and an administrator – to notify users about the news in the system.
Needless to say that as soon as the opportunity to combine multiple machines in a network, users have seized the opportunity not only to use the resources of remote machines, but also to widen your circle of contacts. Created programs designed for messaging users located on different machines. Because of the diversity of computers, operating systems, ways of connecting machines in the network and the objectives pursued with the people, these programs proved to be quite a lot and they are not always compatible with each other.
The most universal means of computer communication – this e-mail. It allows you to send messages to virtually any vehicle on any, since most of the known machines, working in various systems that support it.