(groff.info)Preprocessor Support

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3.2.13 Preprocessor Support
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All macro packages provide support for various preprocessors and may
extend their functionality.

   For example, all macro packages mark tables (which are processed with
`gtbl') by placing them between `TS' and `TE' macros.  The `ms' macro
package has an option, `.TS H', that prints a caption at the top of a
new page (when the table is too long to fit on a single page).