The document summarizes a DDS interoperability demo between multiple vendors in December 2010. It describes the history and specifications of DDS, the participating vendors (Gallium Visual Systems, TwinOaks Computing, Real-Time Innovations, PrismTech), and the scenarios that were demonstrated showing interoperability between the vendors across different platforms, data types, QoS policies, and filtering capabilities. The conclusions were that DDS interoperability works across the vendors, more scenarios will continue to be developed, and the DDS standards enable complete interoperability.