Reversing a monitor image

[blueonblack]

Does anyone know of any software (preferably freeware) that will flip the image on a monitor horizontally so that it displays a mirror image? I need it to flip the image on one monitor but not on a second, with both running off of the same video card. I've got a mod in mind..... :D

[x88x]

Usually that stuff is handled by the driver or the actual hardware; I know my projector will reverse and flip the image by itself, but it looks like nVidia drivers won't let me reverse it..