On my Atari I made a program to invert all colors with a button combination so I could switch between applications as needed. There are some programs around tha

On my Atari I made a program to invert all colors with a button combination so I could switch between applications as needed. There are some programs around that does that in windows now. If you have nVidia drivers they can invert but I don't think that can be done with a button. Windows magnifyer has an inverter built in too. f.lux nicely takes away only the blue light but this isn't always enough for the bright backgrounds of modern homepages and text editors.