Sony VAIO PCG-C1XD Software Manual page 42

Customizing Your Notebook Computer
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Using the Dual Display Function
Customizing the virtual desktop
You can customize dual display mode by changing the position of the two desktops
comprising the virtual desktop.
In the Display Properties screen, drag the icons of display 1 or display 2, moving them
to a new position relative to each other. The two display icons must be connected to
create a virtual desktop. Click OK to apply the change.
Deactivating the dual display setting
You must restart Windows to return to single display mode. Save your work and close
any open applications before returning to single display mode. Follow the steps in the
section above on Selecting dual display mode. In step 7, remove the check from the
Set Dual-Display option. You must restart Windows before the change takes effect.