Broad cast: send message to many sender_id

I want send 1 message to many people with many sender_id.
but i dont know how?
i founded class rasa_core.dispatcher.Dispatcher.
but i dont know how to init object of class Dispatcher outside file
it have 3 argument
1, sender_id: str
2, output_channel:
3, nlg: rasa_core.nlg.generator.NaturalLanguageGenerator

i knowed sender_id but argument 2,3 i dont know how to create,
someone can help me, or give me example send message without in file

many thank