In a forum I used to visit, I found a guy asking if he could connect a desktop to a laptop via USB to use the laptop's screen...
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To be honest I really don't know if that is possible at all, but the entire thought never came up to me top to try or even look it up, as it doesn't really sound logical to me. Then again, I heard people saying when I was checking their computer and I got a Blue Screen Of Death, making me say the computer crashed that it was normal and just a part of the start up procedure, so let's say, I've heard crazier things.