Using old iMac as 2nd display

Hi,
Back in November 2008 i bought an Intel iMac 20". Last friday I bought a new iMac 27". I want to use the 20" one as a second screen. Not as an external display, but be able to see my screen on the 2 computer at the same time. How can I achieve that? I've read on google that people were able to do it, but they never say how (like someone would watch their TV on the iMac)... I've tried screenrecycler, but it doesnt work on 64bits and i've read that over the internet there's always a lag, which is annoying.
Thanks a lot!

Set up the 20" iMac as an external display. Go to System Preferences > Displays > Detect Displays , then select Mirror Display.
If, however, you want your display to stretch across both as one very wide display, then do not check Mirror but instead drag the blue icons into desired position. Place the Menu bar on the desired display and the result will be one display very wide but with the new iMac as the principal space and the 20" as the extension. This is the arrangement that I currently use: 27" iMac + 20" Cinema Display.

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