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# Non-Creatable Classes

#### Topics in this section

- Standard_Flow (const MAXClass): Standard_Flow
- Empty_Flow (const MAXClass): Empty_Flow
- PresetFlow (const MAXClass): Preset_Flow
- ParticleContainer (const MAXClass): ParticleContainer
- ParticleGroup : GeometryClass
- PFActionListPool : ReferenceTarget
- PFArrow (const MAXClass): PFArrow
- PFEngine (const MAXClass): PFEngine
- PFSystemPool (const MAXClass): PFSystemPool
- PView_Manager : ReferenceTarget
- Viewport_Render : Helper