An interface apparatus and method between a computer and an input peripheral are disclosed for activity sensing in the vicinity of the computer and signal activation indicative thereof to the computer so that the computer will not activate its normal security procedures, such as a password protected screen saver mode for example, during times of input peripheral inactivity so long as user presence is sensed. When a user leaves the vicinity of the computer, normal operation of a computer's resident security will control computer function. The apparatus when embodied in hardware includes a detector or sensor that detects the presence of the user, a controller receiving output signals from the detector and monitoring input peripheral activity, and host computer/input peripheral routing circuitry.