Afterglow is a simple system that allow you to draw directly on the projection screen using a laser pointer. The laser pointer can be used as a drawing tool to emphasize items on the screen and can also be used to control the cursor like a mouse. It uses a camera, laser pointer and projector, the USB camera(connect the pc) track the motion of the laser dot, and the Afterglow software automatically calculates for the geometric distortion. Afterglow also has built in slide controls for PowerPoint allowing the user to control their presentation using the laser pointer. The Afterglow system is available in Amazon for $1,980 price tag.