I recently noticed a "device" in Finder called "imac 4". If I click on details, it says PC Server. If I go to the Sidebar preferences, and uncheck Bon Jour, then it disappears, so that tells me it has something to do with this. I have read a little on what this is,and it has to do with file sharing on networks, or shared printers and such. I haven't done anything new that I can think of, so I'm wondering why it just started showing up. Could someone be accessing my network? It is a secured network with an AirPort base station. I'm just really confused, and was hoping someone could ask me some questions to try to narrow this down. Thanks!