Dell Latitude C640 User Manual page 80

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2.
3. Click the buttons under the appropriate pictures (monitor, display panel, or TV) to select your primary
and secondary displays, and then click Apply.
The primary and secondary buttons may look different depending on your configuration. They may
consist of boxes numbered 1 and 2, or they may appear as bulls-eye (primary) and dual-screen
(secondary) icons.
4. Click Yes to keep the new settings.
5. Click OK, then click OK again to close the Display Properties window.