Use older 2008 iMac as second monitor for new iMac

Hi all,
I have one of these older machines that has no real purpose
  http://support.apple.com/kb/sp485
but would serve me very well as a second monitor for my brand spanking new iMac.
The specs seem to note that there is a video output - but I'm not seeing anything about video IN.
Is it possible to use this older iMac as a monitor?

that looks cool, and there is a free trial.
I am not keen on using the WiFi to do this - my old iMac has firewire but the new one doesn't.
Besides using the ludicrously expensive Thunderbolt <-> Firewire 800 convertor
http://store.apple.com/uk/product/MD464ZM/A/thunderbolt-to-firewire-adapter
is there any other way to create a wired connection between these devices? I'm not sure if there is such a thing as a USB <-> USB network connection.

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