An electronic apparatus includes a keyboard unit fixed to the vicinity of the bottom of a display unit. An exemplary piece includes a base and at least a pair of vibrating arms connected to the base. The ADF roller is also mounted on the shaft such that the ADF roller can rotate by receiving a torque only in a first direction. The rider can ride on the half-pipe water ride substantially perpendicular to the water flow from the first curved sidewall across the middle section to the second curved sidewall. A presentation to the user can be automatically scoped to the set of services which are observed as interacting, so that the user can be shown that part of the environment that is immediately relevant to a context in which the user launches the view.