1. A computer user interface system, comprising: a computer including a processor; at least one sensor coupled to the processor and configured to detect a user parameter relative to the computer, wherein the processor is configured to determine a user context based on the detected user parameter and a user presence context based on the detected user parameter; wherein when the user presence context indicates absence of a user from a vicinity of the computer, the processor places the computer in a non-use mode, wherein the non-use mode comprises at least one of a sleep mode, a hibernate mode, or a user logged out mode; wherein the processor is configured to determine a user proximity context based on the detected user parameter; and wherein the processor is configured to alter an appearance of information displayed by the computer based on the determined user proximity context.