1. A system for controlling a computer, comprising: a central processor that runs user-centric applications; one or more biometric input devices that are operatively coupled to the central processor, the one or more biometric input devices providing information relating to physiological traits of a user of the computer, wherein the central processor uses the information relating to the physiological traits of the user to provide a physiological traits-based power-management system, wherein the physiological traits-based power-management system is user-aware due to the information received from the one or more biometric input devices, and wherein the physiological traits-based power-management system drives the dynamic voltage and frequency scaling scheme based on user satisfaction levels that strongly correlate with changes in physiological traits of the user.