NOTE: The ability to stretch the desktop across both displays using Horizontal or Vertical Span modes is available only under Windows XP.
To stretch the desktop across both displays
Make sure you have securely connected the additional displays you want to use to your computer.
Verify that your displays are plugged in and turned on.
From the NVIDIA Control Panel navigation tree pane, under Display, click Set up multiple displays to open the page.
In step 1, select either the Horizontal Span or the Vertical Span option.
In step 2, click the display pair list and select the pair of displays corresponding to the position of your displays. For example, for display pair A + B, you can choose the “A + B” option or the “B + A” option, depending on how your displays are positioned.
The desktop is stretched across both displays.
Note: If any one of your displays isn’t showing an image, make sure to repeat steps 1. and 2. If that doesn’t work, restart your computer and repeat the above steps.