I have a firewalled billion router and I was thinking about setting up p2p. On an old pc. The problem is I have heard that when you open ports on a router than if I get a viruses or trojan it could go to all the PCs on the network. True? And the p2p program has an option for UPnP or Universal plug and play. So if I did that will other pc's in the network still be at risk? And is there anyway to make sure the viruses would not infect the network? Thanks Sorry about the length.