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My wife has iMac 27" (2009) with Snow Leopard and I want to use it as an external monitor for development on Mac mini with the latest Xcode/Lion (I don't want to upgrade the iMac to Lion to get the latest Xcode because I don't want to mess with her computer). Is it a matter of buying a Belkin mini DisplayPort-to-mini-DisplayPort cable and re-using existing keyboard and mouse? Any other issues?

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Would Screen Sharing be an option as well? – patrix Dec 3 '11 at 8:16

You may have already figured this out, but yes. You can buy that cable or the Apple Thunderbolt cable which is backwards compatible with Mini DisplayPort.

Good luck!

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