Stage
The Stage, where remote performers are projected into a 3D world, is a destination module in its own right: it is composited into the final output via two dedicated layers, one for the Skybox and one for the four Performers and platforms. Like any other Layer or Group, each of these gets its own rendering Order, set in Modules settings, making it possible to place other layers between the skybox and the performers, or above the whole scene.
Given the complexity of the Stage and the central place it occupies in the Visual Stage app, its documentation lives in its own dedicated section rather than here. See Stage.