(groff.info)Common Features

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3.2 Common Features
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`gtroff' provides very low-level operations for formatting a document.
There are many common routine operations which are done in all
documents.  These common operations are written into "macros" and
collected into a "macro package".

   All macro packages provide certain common capabilities which fall
into the following categories.

Paragraphs

Sections and Chapters

Headers and Footers

Page Layout Adjustment

Displays

Footnotes and Annotations

Table of Contents

Indices

Paper Formats

Multiple Columns

Font and Size Changes

Predefined Strings

Preprocessor Support

Configuration and Customization