ControlsGlobeFixedZoomInCommand / ControlsGlobeFixedZoomOutCommand Commands

I wanted to understand how the ControlsGlobeFixedZoomInCommand and ControlsGlobeFixedZoomOutCommand commands has effects to the GlobeCamera. Based on observation, they modify the viewFieldangle of the camera.
Are there any other attributes/properties that it modifies?
Asking because the C++ docs didn't specify how this command works.

Thanks in advance