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Q: How many iMacs can I connect using ThunderBolt target display mode?
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Jun 17, 2015 3:29 PMby Mike Sombrio,Target Display Mode: Frequently Asked Questions (FAQ) - Apple Support
Can I connect one TDM-capable iMac to another TDM iMac and then to my computer?
No, each iMac that will operate in TDM must be connected directly to a Mini DisplayPort or ThunderBolt port on the computer with which you are using it. Connecting one iMac to a main computer then another iMac to that iMac will cause the last iMac to operate in TDM for the other iMac rather than the main computer.
