Use iMac as A Second Monitor.
Turn your PC or Mac into a second display
How to use an iMAC as a 2nd monitor for Windows/Any Laptop.
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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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PC to Mac Screen Extend in 5 mins. Without Installing Windows on Mac!!
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How to use your OLD MacBook Pro as an External Monitor/Display