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I have an extra iMac G5 that I no longer use for compatibility & speed reasons, and saw that you can control an additional "virtual" display on an iPhone (such as iDisplay). Is there a piece of software out there that will add another "virtual" external display to my main Mac, so I can control that additional screen through VNC on my G5?

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Are you looking for something like Screen Recycler? It allows you to use another Mac as a secondary display. If I understand your question correctly, this seems to be what you're looking for.

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I did, but it doesn't support 64-bit Mac OS X and is $30 (too much at the moment) – sman591 Apr 29 '11 at 22:43
It supports it now, but I will mention that Screen Recycler has a buggy experience and causes quite a few kernel panics. Beware. – Mike Kormendy Dec 6 '13 at 5:31

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