Using MacBook Display as External Display

The monitor for my Mac desktop is actually an HDTV and being used as such, and I'd like to move my desktop into a room separate from the living room until I get a new tv, and I was wondering if anyone knew of a way that I could connect my desktops display ports to the Mini-DVI on the MacBook therefore making the MacBook a monitor or something along those lines, preferably without it shutting down?

Oh wow, it looks like it might work, I can't tell but how are they connected, just over a network?
Hopefully I'll be able to share screens with my screenless desktop and activate it.
Thanks!

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