A method and apparatus provides supplemental power to an engine. In particular a shipper may contact a carrier using any communication device, such as a cellular telephone, standard landline telephone, personal digital assistant, personal computer, laptop, or other wired, wireless or optically-based device, in order to communicate shipping information to the carrier and, in response, receive a unique easy identifier. The pile is aerated and contacted with an aqueous solution. In an embodiment of a method for indicating a position of an item to be processed from a shelf, the method includes moving the indicator on the frame member such that the indicator is positioned in front of the item to be processed from the shelf.