1. A method comprising: optically receiving a first portion of a visual representation of a video signal on a portable electronic device; decoding on the portable electronic device the first portion to reproduce a first auxiliary data portion contained within the first portion, the first auxiliary data portion being modulated in an active portion of the first portion of the video signal, the active portion being included in the visual representation; determining whether the first auxiliary data matches at least a first portion of stored data on the portable electronic device to identify a first data match, the stored data being stored on the portable electronic device prior to the receiving of the first portion; and illuminating a first light-emitting device on the portable electronic device when the first data match was identified.