How do you write a request letter?

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For the business people here. What are some pointers and suggestions you can give to the non-business people who are trying to learn. When writing request letters. What is a request letter? All I know.. Is that inside a request letter.. It is suppose to included the information needed. (The bullet points.) What are bullet points? .. And when You need it by... and Where and how to send it. Thanks, - DNatureofDTrain