HRESULT XGameStreamingRegisterClientPropertiesChanged(  
         XGameStreamingClientId client,  
         XTaskQueueHandle queue,  
         void* context,  
         XGameStreamingClientPropertiesChangedCallback* callback,  
         XTaskQueueRegistrationToken* token  
)  

    // On client connection maintain a list of clients and do per client initialization
    void GameStreamingClientManager::OnClientConnected(XGameStreamingClientId client)
    {
        StreamingClient connectedClient;
        connectedClient.clientId = client;
        connectedClient.propertiesChangedToken = token;

        // Do per-client initialization
        XGameStreamingClientPropertiesChangedRegistrationToken token = {0};
        XGameStreamingRegisterClientPropertiesChanged(
            client, m_taskQueue, this, &OnClientPropertiesChanged, &token);        

        connectedClient.propertiesChangedToken = token;
        m_streamingClients.push_back(connectedClient);
    }

    // Some of the properties of our streaming client have changed, react to any of the changes which apply to our game
    void GameStreamingClientManager::OnClientPropertiesChanged(
        void* context,
        XGameStreamingClientId client,
        uint32_t updatedPropertiesCount,
        XGameStreamingClientProperty* updatedProperties)
    {
        GameStreamingClientManager* gsClientManager = reinterpret_cast<GameStreamingClientManager*>(context);

        for (uint32_t i = 0; i < updatedPropertiesCount; ++i)
        {
            switch (updatedProperties[i])
            {
                // The client now has a new physical size of the game stream - update our list of stream
                // sizes to reflect this.
            case XGameStreamingClientProperty::StreamPhysicalDimensions:
                gsClientManager->UpdateClientPhysicalDimensions(client); 
                break;

            case XGameStreamingClientProperty::TouchInputEnabled: 
                gsClientManager->UpdateClientTouchEnabled(client); 
                break;

            default:
                // A characteristic we are not tracking - do nothing
                break;
            }
        }
    }