Wireless Network

My dad recently got wireless broadband with a nb5+4w modem. He has a desktop and a laptop both connected wirelessly to the modem. In order for his 2 computers to file share with each other in a home network environment does comodo need to be configured specifically? A trusted network? I am relatively new to the firewall game(my dad knows less) but it seems if I make the wireless modem a trusted network I would be trusting the internet? Can someone offer me some advice?

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