A backlight unit adapted to implement enhanced light efficiency and uniform brightness is disclosed. The multi-media message is created by a sender and contains an animated entity that delivers an audible message. The ink set satisfies any one of the conditions in the first embodiment: the colorant is anionic, the liquid has a pH of not higher than 6. Preferably, the computer system’s hardware resources, including real address space, is logically partitioned, partitioning being managed by an ultra-privileged process called a hypervisor.