Dell Latitude D630 - Manual (Page 59)

Using the Display 59
Swapping Primary and Secondary Displays
To swap your primary and secondary display designations (for example, to use
your external monitor as your primary display after docking):
1 Click the Start button and click Control Panel.
2 Under Pick a category, click Appearance and Themes.
3 Under Pick a task..., click the area you want to change, or under or pick a
Control Panel icon, click Display.
4 Click the Settings tab→ Advanced→ Displays tab.
See the documentation that came with your video card for additional
information.