The instant application discloses, among other things, techniques to allow simplified Gesture Interface, which may provide a consistent, easy-to-remember interface for performing various actions with a portable device, including, but not limited to, sharing files, data, and information, winking, waving, pointing, picking up, and dropping. A second pulley is mounted to an arbor that extends into a spring housing containing an elastic member. The pair of movable structures include a pair of hand grips which are to be moved by the user when supported by a user support structure connected between the pair of movable structures. The semiconductor processing devices receive slurry from each of the slurry supply devices through the slurry supplying lines to perform semiconductor processing.