The N-trig DuoSense Composite Root Interface is part of the driver software for N-trig's DuoSense technology, which provides touch and stylus input functionality for compatible touchscreen devices. N-trig DuoSense is often used in devices like tablets or hybrid laptops, enabling features like touch gestures and stylus-based drawing or writing.

In a Windows environment, the N-trig DuoSense Composite Root Interface driver typically helps to interface the touch screen and stylus with the operating system, allowing it to recognize touch inputs, gestures, and pen strokes accurately. If this driver is missing or outdated, it could cause issues with touchscreen functionality, like unresponsiveness or improper calibration.