The 2C had autographic features that allowed the photographer to write information on film (such as dates or names) at the time of exposure. Photographers wrote on a piece of carbon paper, and placed this paper between the film and the paper backing. During exposure, the information transferred to the film. Later, camera makers made autographic cameras with a built-in window and stylus for easier writing, such as this one. Do you see the window on the back of the camera?
The 2C also had a shutter cable release. A cable release operated the shutter—minimizing the risk of shaking the camera.