Hi, I know this sounds stupid, but I've got a wireless router thats supplying internet to my iMac in my bedroom, my mom's PC laptop in her room, and the family eMac is physically connected to the router via ethernet. When my older sister is home, her PC in her room picks up the wifi signal as well. Oh, and there is an older G3 iMac also physically connected to the router via ethernet routed through the wall, into the attic, and down again into my parent's room. So, my dad wants me to set up a network so that all the computers can share files, you know, like just have a specific folder on each computer that is accessible to everyone on the network. Also, he wants to be able to use any of the three printers in the house from each of the computers (specifically my mom's PC laptop). I assume I have all the hardware/software needed, but how do I set this up? I'll settle for networking the three Macs, first. All of them have OS X. Help?