What is the relation between X server and display?
Can multiple X servers run simultaneously on the same display?
Can a X server run simultaneously on multiple displays?
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The display is effectively the X server; there is exactly one display per X server. So multiple X servers can’t run simultaneously on the same display, and an X server can’t run simultaneously on multiple displays. (Strictly speaking, the latter point isn’t correct, but I don’t think there’s an X server which can serve multiple displays.)