A printer for printing a first interface onto a first surface, thereby to generate a first interface surface. The first interface includes first coded data and is at least partially based on first document data. The document data includes first identity data indicative of at least one identity, the identity being associated with a region of the first interface. The printer includes an actuator in the form of a button, a coded data generator to generate the first coded data based at least partially on the first identity data, and a printing mechanism. When the button is pressed, the printer prints the first interface onto the first surface.