A beverage dispenser provides numerous inventive features in its refrigeration system, diluent delivery system, concentrate delivery system, mixing and dispensing system, and control system. An administrator initiates transmission of the message simultaneously to a first group of user contact devices for all users in the at least one group of users, then simultaneously to a second group of user contact devices, using the user selected priority information. An overlapping area of the basic area and the element area is calculated to be a placement area. An apparatus for performing the method is also provided. However, before writing the files to the backup image, the server generates an offset map to indicate where in the backup image each file will be located. In another embodiment, the object beam and the edge-lit reference beam move in unison with each other while the holographic recording material remains generally stationary.