What do you do if you see a black HP Display Control Service from portrait.com needs to be updated popup warning? Is it legit & safe to download & install?

Do not attempt to use the second monitor to extend the desktop. HP TouchSmart software does not support this type of desktop expansion, and doing so may cause your computer to act erratically.

HP's new S430c monitor features a 43.4-inch diagonal display and can control two PCs at once.