I currently have a 4 pcs networked through inthernet cable and router. All of these pcs share files and printers. I want to put a wireless access point on this network. I want users to be able to use the wireless for internet access only; I do not want them to have access to files on hardwired pcs on network. Is this possible? Preferably I'd like the hardwired pcs to be fully insulated from any nasty that might come in through wireless access point.