| Interface | Description | 
|---|---|
| EventEmitter.EventObserver<C> | Observes events emitted by EventEmitter | 
| OutputHandler.ECHO | explicitly repeated input (repetition of the content of input ECHO commands) | 
| OutputHandler.ERR | warnings, errors & exceptions | 
| OutputHandler.EXE | operation execution | 
| OutputHandler.IN | implicitly repeated input (a repetition of all input) | 
| OutputHandler.OUT | conversational (judgments, questions, etc...) output | 
| TextOutputHandler.LineOutput | 
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