SCREENER documentation

I want to use the SCREENER App from EIKON to get data regarding public and private companies and their main business filed (industry) + description. Is there any kind of documentation e.g., what is/ are the data sources for each field, ...? Additionally, I am looking for an official description/ table that decribes each TRBC Industry code (eventhough that might be part of the documentation/ can partially be derived when using the SCREENER app).

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