Abstract: An apparatus for capturing images and barcodes. The apparatus has an image-sensing device and a lens having a variable-focal-length region and a substantially fixed-focal-length region. The variable-focal-length region focuses light onto a first region of the image-sensing device and the substantially fixed-focal-length region focuses light onto a second region of the image-sensing device. The variable-focal-length region varies such that different portions of that region of the lens focus objects at different distances from the lens in different areas of the first region of the image-sensing device. Thus, the device is able to focus, in the first region of the image-sensing device, objects at varying distances from the apparatus.

Abstract: A method by which one node can search for and retrieve information from another node. A message identifying the sought-for information item and an address is created at a first node. The address identifies a repository for the sought-for information. A second node receives the contents of this message and responds with the information item if the item is available. Otherwise, the second node propagates the message to other nodes. The message is propagated from node to node until it reaches a node having the sought-for information item. If this node can connect to the specified address, it sends the information item to the repository. Otherwise, the node adds the information item to the message, which is propagated to other nodes until the message reaches a node that can connect with the address. The information item can then be retrieved from the repository.