Abstract: The present disclosure provides a system, apparatus and means for addressing the limitations of existing technology and practices with respect to in-store advertising. The present disclosure enables marketers to direct commercial messages to consumers whilst enabling consumers to control or influence if and when messages are received, as well as the content of the messages. The disclosure can provide this functionality is through the use of broadcast beacons and demand beacons. The disclosure also provides a means for interacting with applications located on PEDs, including from a sleeping or non-active state and ensuring that the messages transmitted are secure. The disclosure also provides a means for marketers to design, track and alter in real-time a marketing strategy, including on a store-by-store basis.