The Digital Frontier, officially The Digital Frontier: Mapping the Other Universe, is a renowned book written in the mid 1980s by Kevin Flynn, who was the CEO of ENCOM at the time. The book presents many of his thoughts and observations about his TRON system and the programs that reside therein.
Excerpt Pg. 150
An excerpt from page 150 of Digital Frontier is published on a Flynn Lives website (Excerpt Two - Flash required). The excerpt focuses on the evolution of programs within the system.