The N-trig DuoSense Secondary Interface is a driver associated with N-trig's DuoSense digitizer technology, which was commonly used in touchscreen devices such as laptops and tablets, particularly those that support multi-touch and pen inputcapacitive touch and active penSurface tablets before Microsoft fully transitioned to its own in-house technology, Surface Pen.

The Secondary Interface typically refers to a part of the driver that manages interactions with additional features of the N-trig DuoSense digitizer, like secondary touch or pen input functionalities.