| Class | Description | 
|---|---|
| Effect | An effect -- either UIEffect, PolyUIEffect, or SafeEffect. | 
| Effect.EffectRange | |
| GuiEffectChecker | |
| GuiEffectTypeFactory | Annotated type factory for the GUI Effect Checker. | 
| GuiEffectVisitor | Require that only UI code invokes code with the UI effect. |