by Trent A. Fisher and Werner Lemberg - The GNU Operating System

22 The GNU Troff Manual
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).
3.2.14 Configuration and Customization
Some macro packages provide means of customizing many of the details of
how the package behaves. This ranges from setting the default type size to
changing the appearance of section headers.