I need to share files between my PB (10.4.9) and my iMac (10.3.9). The problem is the way I have my network set up. I have my modem plugged into a 5-port switch, feeding 3 computers (including the iMac) internet. The remaining port plugs into my AirPort Express Base Station which allows my PB to connect to the internet wirelessly. Everything works great except my iMac can only see the other computers plugged into the switch, and cannot see my PowerBook. Is there anything I can do to link these two computers together other than change my network configuration?