Use iMac as A Second Monitor.
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Turn your PC or Mac into a second display
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How to Turn an Old iMac into a 2nd Monitor - Cheaply!
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Use an iMac as an External Monitor
Connect two laptops via HDMI to get a second screen for your primary laptop (Windows or Mac)
old imac as main monitor or external monitor
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Target Display Mode: Using an iMac as a monitor
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MacBook Pro WITHOUT the Screen?
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