shared computer

Hello,

For the past couple of months there has been a computer listed under the "Shared" computers. I know that this indicates someone is on my network, but the thing is I am connected directly to our cable modem. Is the computer truly on the network, or is it there for some other reason? Thanks in advance for your help!

-Johnny

Did you connect to those computer before?

No. Now, I was in an apartment building and someone may have gotten our network.