This document provides information about cash book and letter of demand in business documents. It explains the types of cashbook, advantages of cashbook, and performa of cash book. It also discusses the advantages of sending a letter of demand and provides its performa. The document also covers topics like appropriate technology and software application, layout and style of publication, elements of document design, format and style, organizational requirements, memorandums and emails, letters, efficient entry of information, functions to ensure consistency of design and layout, input devices, consequences, checks, storing a document, document design and production, benefits of proofreading, modification, naming and saving, and printing document.