No it's not necessarily from cover to cover. It's useful if one pass is however.
TOC, index and chapter headings are your guide as to what part of the book you are going to activate to get the answers that meet your purpose, curiosity and questions.
How many passes? as many as it take for you to get the book to gel.
Alex
[This message has been edited by Alex K. Viefhaus (edited July 23, 2004).]
