This book is dedicated to one word processing software that has been supported on unix systems. Unix has a powerful formatting and typesetting tool called nroff/ troff which is capable of performing from a simplest to a very complex document processing for typesetting with as little knowledge on unix systems. It also allows users to produce formatted output on a variety of devices from line printers to typesetters. This book provides a complete description of the capabilities of unix document processing and typesetting to a variety of readers. The concepts and its usage are illustrated by examples. In addition, it describes in detail the AT&T supported mm macro package, mm provides a user friendly interface and makes life easier for the users of nroff/ troff. A concise and yet a complete quick reference guide to nroff I troff and mm is included to help more advanced users of the unix document and typesetting system. The book is also augmented with the description of various unixpreprocessor tools such as tbl for typesetting tables, eqn a tool to typeset equations and pic for drawing pictures.