op.preface

sets automatic preface formatting.

Heading text is centered at the top of the next page and begins a separate page numbering scheme.

If a '.preface' command has already been issued, the page numbers resume where the last '.preface' command ended.

Preface sections appear in the Table of Contents with Roman numeral page numbers. To set the page numbers in the Preface header/footer to Roman numerals, specify 'r' in the '.footing' command.

Preface mode continues until an '.xpreface' command is encountered.

The '.pf' command is equivalent to the '.preface' command.