In last year’s ITA workshop, I presented the concept of Networks without Borders, which allow for the dynamic establishment of virtual networks from a pool of wireless resources, encompassing spectrum, infrastructure, and management and control functionality. This year’s presentation focuses on some of the resource management issues that arise from resource sharing in wireless networks. In particular, we explore the problem of sharing heterogeneous resources, describing a method for identifying and assigning fungible and orthogonal sets of channels to be exploited by different networks operating in a dynamic spectrum access regime.