``TeX by Topic is a systematic reference manual designed as a companion to tutorial guides on the system. Packed with original, practical ideas, this book provides an invaluable information source that will give the TeX user the essential insight needed to solve TeX problems.
TeX by Topic is not for the novice; it is meant for users with a basic understanding of TeX who have specific questions, or who are keen to explore the full potential of this unique computer typesetting system.''