3.2 Common Features =================== 'gtroff' provides very low-level operations for formatting a document. There are many common routine operations that 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 that 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