Solve : file ends up on other computer?

1.	Solve : file ends up on other computer?
Answer» Last week a file ended up on my computer from my roomate's computer. Does anyone know how this would have happened? We have an unsecured wireless network. Something similar happened to a friend of mine last year, where files from his computer ended up on his roomate's, but I don't know how. I wanted to secure both computers so it won't happen again. Any information would be greatly appreciated so I can solve the problem, if POSSIBLE, and put her MIND at ease. By any chance , are both of these computers set up on a network to share a common Printer and file share ? Is the network yours ? DL65 no they are not networked together other than the internet network...

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