Abstract: A first type of processor-based device, such as a personal computer functioning as a host and containing digital media files, may wirelessly communicate with a second type of processor-based device, such as a digital picture frame (DPF). Upon request and/or upon the occurrence of certain conditions, the host may transmit menu and/or media file choices to the DPF. Responsive to user choices entered at the DPF and transmitted to the host, the host may transmit further menu choices and/or media files to the DPF. In one embodiment, the menu choices displayed on the DPF reflect a DPF file hierarchy that is identical to that of the host. An electronic appliance and a machine-accessible medium are also described.

Abstract: Deterring a rollback attack against a first database by determining if the first database is corrupted, the first database being associated with a first authentication code, determining if a second database is corrupted when the first database is corrupted, the second database being associated with a second authentication code, the second database having contents substantially the same as the first database, and when the second database is not corrupted, recalculating the second authentication code using a portion of the first authentication code, copying the second database over the first database, and proceeding with authorized operations for processing content by an application program.