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Linux $DISPLAY results the same in different monitor (dual GPU/dual monitor setup)

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I have two monitor connected to two separate GPU, and I have an application that display the GUI result in "display"=$DISPLAY. I open two different terminal in each monitor and echo $DISPLAY, they both output the same result :1. I thought they should output :0 in one monitor and :1 in the other one. Please help me to understand this, I am new to X-server and dual GPU settings.

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