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Types of Structuring Command
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   The chapter structuring commands fall into four groups or series,
each of which contains structuring commands corresponding to the
hierarchical levels of chapters, sections, subsections, and
subsubsections.

   The four groups are the `@chapter' series, the `@unnumbered' series,
the `@appendix' series, and the `@heading' series.

   Each command produces titles that have a different appearance on the
printed page or Info file; only some of the commands produce titles
that are listed in the table of contents of a printed book or manual.

   * The `@chapter' and `@appendix' series of commands produce numbered
     or lettered entries both in the body of a printed work and in its
     table of contents.

   * The `@unnumbered' series of commands produce unnumbered entries
     both in the body of a printed work and in its table of contents.
     The `@top' command, which has a special use, is a member of this
     series (makeinfo top).

   * The `@heading' series of commands produce unnumbered headings that
     do not appear in a table of contents.  The heading commands never
     start a new page.

   * The `@majorheading' command produces results similar to using the
     `@chapheading' command but generates a larger vertical whitespace
     before the heading.

   * When an `@setchapternewpage' command says to do so, the
     `@chapter', `@unnumbered', and `@appendix' commands start new
     pages in the printed manual; the `@heading' commands do not.

   Here are the four groups of chapter structuring commands:

                                                            No new pages
     Numbered       Unnumbered       Lettered and numbered  Unnumbered
     In contents    In contents          In contents        Not in contents
     
                    @top                                    @majorheading
     @chapter       @unnumbered          @appendix          @chapheading
     @section       @unnumberedsec       @appendixsec       @heading
     @subsection    @unnumberedsubsec    @appendixsubsec    @subheading
     @subsubsection @unnumberedsubsubsec @appendixsubsubsec @subsubheading