The `subsub' Commands
=====================
The fourth and lowest level sectioning commands in Texinfo are the
`subsub' commands. They are:
`@subsubsection'
Subsubsections are to subsections as subsections are to sections.
(Note:`@subsection'.) In a printed manual,
subsubsection titles appear in the table of contents and are
numbered four levels deep.
`@unnumberedsubsubsec'
Unnumbered subsubsection titles appear in the table of contents of
a printed manual, but lack numbers. Otherwise, unnumbered
subsubsections are the same as subsubsections. In Info, unnumbered
subsubsections look exactly like ordinary subsubsections.
`@appendixsubsubsec'
Conventionally, appendix commands are used only for appendices and
are lettered and numbered appropriately in a printed manual. They
also appear in the table of contents. In Info, appendix
subsubsections look exactly like ordinary subsubsections.
`@subsubheading'
The `@subsubheading' command may be used anywhere that you need a
small heading that will not appear in the table of contents. In
Info, subsubheadings look exactly like ordinary subsubsection
headings.
In Info, `subsub' titles are underlined with periods. For example,
@subsubsection This is a subsubsection
produces
This is a subsubsection
.......................