Dell E2414H Monitor - Manual (Page 30)

58  Setting Up Your Monitor Setting Up Your Monitor  59
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(d) Setting Display Styles For Multiple Monitor
After the external monitor(s) have been set up, users can select the
desired display style from Multiple displays menu: Duplicate, Extend,
Show Desktop On.
Duplicate these displays: Duplicate the same screen on two monitors
with the same resolution, chosen based on the monitor with a lower
resolution.
(i) For Windows Vista ®
[DUPLICATE NOT AVAILABLE]
(ii) For Windows ® 7