hello. how is networking done in a lan house... im talking about the internet connectio, they have two main computers, one of them connects to the internet (same cable internet provider i have at home), that computer connects to a hub in wich all the other twenty computers also connect. all computers have the same internet protocol address run microsoft windows xp with no internal or software firewall... in the other day i found out that one of the computers has a door opened, one used by a trojan, it tried it at home, connect to the ip address, but it didnt work, wich is good... but how is this done? if i try to communicate with one of the computers how can that be done? all of them have the same internet protocol number... anyone wants the number, maybe you could get some information.