The Render Production command, available on the Render flyout on the main toolbar, renders the scene using the current production render settings without opening the Render Setup dialog. You can activate Production rendering mode without rendering from the drop-down list in the bottom-left corner of the Render Setup dialog, and in the top-right corner of the Rendered Frame Window.
You assign which renderer to use for production rendering on the Assign Renderer rollout of the Render Setup dialog 
Common panel.
