In the Edit Objects dialog, numerous features can be changed in tandem for the same object in all models, or even for all objects in all models. These include: material properties, transparency, point size, line width, the drawing data type and style, object color, and whether objects are on or off. However, when Group is selected in the Edit control of that dialog, only the objects in the current model will be changed, regardless of the setting here.
In the Edit Controls menu, the clipping planes and perspective can be changed together, and typing a value into the Scale box will set all models to the same scale. If the zoom is changed with arrow buttons or hot keys, all models will change their zoom by the same amount.