The TeX Reference Manual is the first comprehensive reference manual written by a programmer for programmers. It contains reference pages for each of TeX's 325 primitive control sequences. Over 80% of its reference pages contain examples that range from simple to challenging. Each example is typeset verbatim in a style which is easy to read and experiment with. TeX Reference Manual also just typesets the example, so you can see what it makes, and explains how the example works. The description on each primitive's reference page is an annotated discussion of The TeXbook's treatment of the primitive. That means a TeX user will find it natural to move back and forth between the two books. One of TeX Reference Manual's innovative features is families. They simplify the search for the primitive which performs a particular task.