Invert / Inverse display colors on windows 7

Invert / Inverse display colors on windows 7

Cancelled

Job Description

Need system-wide function to invert whole display (colors) on windows 7/8 using a preset hotkey combination to toggle off/on.

This is for visually impaired person.

Currently done by NVIDIA drivers, which supports this option.

It needs to work with any display chipset.

Powerstrip supports this nicely but overkill.
Only need 1 function.

Small, efficient method is preffered.
ie; C or similar.