I have the latest macbook and so does my sister. On her computer, under the shared sidebar, are shown all of the computers connected to our home network, such as my macbook, my dad's windows xp laptop, and my Vista pc. However, my macbook only displays my sister's macbook and no other devices. I've looked at all the settings on her macbook and compared them to mine - they are the same. Why is it then, that my mac doesn't see anything else? I've reinstalled the system, but that didn't help.