commands are, respectively, the unnumbered, appendix-like, and
heading-like equivalents of the
@unnumberedseccommand may be used within an unnumbered chapter or within a regular chapter or appendix to provide an unnumbered section.
@appendixsectionis a longer spelling of the
@appendixseccommand; the two are synonymous. Conventionally, the
@appendixsectioncommand is used only within appendices.
@headingcommand anywhere you wish for a section-style heading that will not appear in the table of contents.