Radio Dynamic Zones (RDZs) are being explored by the research community as an approach to safely test and evaluate spectrum sharing mechanisms and technologies. There is general consensus in the research community regarding the conceptual architecture of an RDZ. In this paper, we present our work on the POWDER-RDZ, a prototype RDZ developed and built on the POWDER platform. We present a practical RDZ architecture and explore a number of end-to-end use-cases. We present the design and implementation of OPENZMS, our prototype RDZ Zone Management System, and evaluate it in the POWDER platform.