User`s guide

NVRotate
The NVRotate settings let you view your Windows desktop in Landscape or
Portrait mode. You can rotate your desktop by 90, 180, or 270 degrees.
The following desktop rotations options are available:
Landscape is the default mode.
Portrait results in a 90 degree rotation.
Inverted Landscape results in a 180 degree rotation.
Restore Default results in the default Landscape mode.
Click OK after selecting an option for the rotation change to take effect.
You can click one of the two arrow buttons shown on the NVRotate page to perform
the rotation.
Or you click the semi-circular arrow on the top right of the screen image and drag it in
the direction of the rotation.