SOLVED Connecting two iMacs with thunderbolt cable

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Can I connect a 2009 iMac with OS Sierra 10.12.6 to an iMac with OS Big Sur 11.6.1? I have purchased two thunderbolt cables and cannot get one of the iMacs to operate as a second screen. Thought maybe I had a bad cable, but two bad cables? Maybe I'm trying to connect two incompatible OS's??
 

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