Hi Fernando,
In a message of  to All (), you wrote:
 FAG> Well, I need to get information about communications' protocols, about
 FAG> networks' configurations (token ring, star (?), and so on...) and about
 FAG> how are they implemented....
http://www.hojmark.org/networking.html is just one place to start
Mvh, Asbjorn Hojmark 
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