connecting macbook pro to imac screen?

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So I want to use my iMac as a second screen to my macbook pro.. am I right in thinking all I need is a double ended mini display port?

 

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Correct, it uses "Target Display Mode"

https://support.apple.com/en-us/HT204592

 

Thanks just ordered my lead I was getting confussed between the thunderbolt lead and had doubts so wanted confirmation.