My landlady has approached me and offered to pay half my internet costs if I would run a network cable downstairs to her daughters apartment. This is not a problem as my router still has 2 open slots. My concern now is both for her and me. What do I do now exactly to be sure that she cannot get into mine or my kids PC, and vice versa?? I have never set anything up for networking or for sharing. I would like to know just how to prevent her from the possibility, and give her peace of mind, knowing as well that either PC cannot be "hacked" by the other.I am aware of the need for onboard LAN or an ethernet card......just need to know what to do in XP (assuming she has XP as well) to prevent accidental invasion, or intentional for that matter. Thanks