Aura-net is a mobile communications system whose function realizes a new form of proximity-aware networking, and whose form points in the direction of a "Proximity-aware Internetwork." The system is founded on an implementation of a "wireless sense." The existence of such a sense, it is argued, is essential for realization of a vision of Ubiquitous Computing famously expounded by Mark Weiser [1]. Moreover, current wireless technologies are ill-suited to enabling this vision. The proposed wireless technology (FlashLinQ) is described at a conceptual and tutorial level.