These classes are in place to allow MAXScript to register Arnold shaders. These classes are not createable in MAXScript, and do not expose any parameters.
AnaglyphFragment: GraphicsFragmentPlugin
BackgroundFragment: GraphicsFragmentPlugin
BlendFragment: GraphicsFragmentPlugin
BlitFragment: GraphicsFragmentPlugin
CacheSubGraphOutputFragment: GraphicsFragmentPlugin
ClayFragment: GraphicsFragmentPlugin
ColorTargetToPresentableTargetFragment: GraphicsFragmentPlugin
DefaultLightWorldGenFragment: GraphicsFragmentPlugin
DepthFragment: GraphicsFragmentPlugin
DisplayAdaptiveDegradeResultFragment: GraphicsFragmentPlugin
FastShadingFragment: GraphicsFragmentPlugin
FragmentGraph: GraphicsFragmentPlugin
GammaCorrectionFragment: GraphicsFragmentPlugin
GhostFrameFragment: GraphicsFragmentPlugin
GhostRenderFragment: GraphicsFragmentPlugin
GhostWorldGenFragment: GraphicsFragmentPlugin
GizmoFragment: GraphicsFragmentPlugin
GraphicsFragmentPlugin: MAXWrapperNonRefTarg
IlluminanceFragment: GraphicsFragmentPlugin
MemoryTargetToOGSTargetFragment: GraphicsFragmentPlugin
NitrousLightWorldGenFragment: GraphicsFragmentPlugin
NitrousPostSceneWorldGenFragment: GraphicsFragmentPlugin
NitrousPreSceneWorldGenFragment: GraphicsFragmentPlugin
NitrousRenderWorldGenFragment: GraphicsFragmentPlugin
NPRFragment: GraphicsFragmentPlugin
ObtainRenderTargetFragment: GraphicsFragmentPlugin
OverlayFragment: GraphicsFragmentPlugin
PostSceneFragment: GraphicsFragmentPlugin
PreSceneFragment: GraphicsFragmentPlugin
ReflectionFragment: GraphicsFragmentPlugin
SelectionFragment: GraphicsFragmentPlugin
SelectionPreviewFragment: GraphicsFragmentPlugin
StereoFragment: GraphicsFragmentPlugin
ToneMappingFragment: GraphicsFragmentPlugin
TooltipFragment: GraphicsFragmentPlugin
UpdatePerViewWorldGenFragment: GraphicsFragmentPlugin
WireframeFragment: GraphicsFragmentPlugin
XORRenderFragment: GraphicsFragmentPlugin