A user interface having a plurality of user interface elements for marking, finding, organizing, and processing data stored in a computer system. Each element typically has an appearance which is related to the data or function the element is designed to represent or perform. The elements may simply mark data within the document, or may be programmed to cause the computer to perform some function in association with the marked data. Methods of marking data and searching the memory for marked data by use of switches or buttons is disclosed. Further, useful elements for systems such as computerized camera systems, portable multimedia systems, and remote controls are also described. Some of the user interface elements of the present invention may have an appearance and/or functionality dependent upon the context in which the element is used, and/or dependent upon the user's identity. Methods for arranging the elements in stacks, and for providing for automatic application of elements to captured image data are also disclosed.