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Possibly I have interpreted this question in different way. Please correct me if I am mistakenly wrong. First I will use the term screen and display interchangeably.
In practice, often people need to work on more than one single screen. That's the second display is needed. For instance, the second screen is needed when one wants to expand the limited work space of any application window (e.g. Excel's worksheet) he/she is working at using one screen, i.e. primary screen. In this scenario, the second screen, i.e. secondary screen, will be useful for displaying the expanded view of the running application.
For some reason, one can set the secondary screen as the primary screen. When this option is selected, then the primary screen will be assigned to the second monitor and the first monitor will be detected as secondary screen.
This situation become clearer when the issue is applied to a laptop computer which has primary monitor as integrated part of the computer and the second monitor can be attached using VGA or DVI (Digital Visual Interface) port. By default the primary screen is assigned to the primary monitor.
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