Dell P2314T Multi Touch Monitor with LED - Manual (Page 48)

48 Appendix
Display Styles For Multiple Monitors
After connecting external monitors, you can choose to duplicate, extend, or use only
one of the monitors.
Duplicate displays
This option shows the same content on all monitors. The resolution of all monitors is set
to match the monitor with the minimum resolution.
Windows Vista
[DUPLICATE NOT AVAILABLE]
Windows 7
Windows 8/Windows 8.1