KeyLemon will also lock the computer if it detects that nobody in front of the computer. If the face in front of the Webcam isn't yours, KeyLemon locks the computer-but not before taking a photo of the hijacker. From there, KeyLemon defaults to checking the Webcam every 10 seconds, although you can always bypass it with your text-based log-in.
Once installed, the program's Wizard will walk you through creating a profile of your face, and link it to your computer's log-in. The latest version of the app also comes with a neat Firefox plug-in called LemonFox, for added protection when logging into Facebook, Twitter, and LinkedIn. More than just a glorified Webcam tool, it regularly checks to make sure that it really is you using the computer. KeyLemon logs you in to your computer by using your face.
