I have this "school" with 3 PCs connected to a wireless router and DSL modem. For some weird reason (something to do with usage costs), the adjoining corporate office has 3 other PCs that are connected via traditional cat5 router and cable modem. They're wondering if there's some way to uplink the two LANs for basic peer-to-peer file sharing. If so, can you point me in the right direction as to how it's done? Thanks.