iMac and iBook Extended Desktop
Apple’s iBook and iMac ranges do not support screen spanning by default although it comes with a graphics chipset (ATI Radeon Mobility) that supports the feature. What’s screen spanning? It’s something like an extended desktop where your desktop area stretches across two monitors instead of both monitors displaying the same thing. They say once you’re used to dual displays you won’t go back. iBook and iMac users can actually experience this, with a tool called the Screen Spanning Doctor.
It involves hacking the Open Firmware to enable screen spanning support, a feature available on PowerMacs and PowerBooks.
BTW please don’t try this on notebooks that run other chipsets like the older ATI Rage, as it will screw up your hardware! The list of officially supported machines and machines that are not supported are available here.
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