Dell E2014T 19.5 Multi-Touch Monitor with LED - Manual (Page 49)

Appendix
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49
Windows 7
1. Right-click on the desktop and click Screen resolution.
2. Click Multiple displays to choose a display selection. If you do not see the
additional monitor listed, click Detect.
NOTE: If your computer does not detect the second monitor, restart your
computer and repeat step 1 to step 3.