I've read some threads that talk about this, but I just don't understand. It may be a very basic thing but I'm new to Macs and I just don't get it. I'm on Lion, Macbook Pro. Can someone explain this to me in basic terms or point me in the direction of support documentation? What is the Shared list that appears sometimes in the sidebar of my Finder? Who are those other computers off-and-on listed there? Are they connected to my computer or my wireless account or something? I assume that if they're apparent to me, I'm apparent to them -- I don't like the sound of that, so is there some way I can make myself invisible to them? What is my "network"? Today and once before I couldn't connect to the internet and the error message read something about another "device" on my "network" having the same IP address as me, and I should contact my "network provider." What do they mean by "device"? What is my "network"? (I have not connected this computer with other computers or "devices" in my household. Is "network" my internet service, and my "network provider" my ISP?) My internet settings are set to DHCP, which someone told me in the past means this problem about two devices having the same IP address shouldn't be happening -- so what is going on?? Are these two issues related? Thank you!