Two computers side by side is still way better than this approach. I have got a 22" widescreen on my main computer which is not connecetd on line for obvious reasons. Next to it I am running an Apple laptop that is on line. It has all my manuals on it, Groove 3 vids and can go on line. Its audio is also connected to my main digital mixer so I can hear it and record it too easily on the main machine.
I just find this works best for me allowing you to view help files and videos and things while not interfering in any way with the main computer. It works very well. A bit extravagant but great none the less. I found it difficult trying to read help files and watch videos on the main machine without getting in the way of the main real estate.