I live in a house with 5 other people and don't know all of them that well. The one man who sets up the wireless network knows loads about computers and my question is would he be able to a) get my screen up on his computer from other parts of the house, b) see when i am typing in passwords or bank details and c) upload viruses from his computer onto mine. If any of these things are possible (which i do suspect they are) is there a way to protect my computer from this? I would be very grateful of any helpful replies. Thanks.