\starttext

% \setuphead[number=no]

\definehead[xxx][subsubsection]

\chapter{Chapter}
\section{Section}
\subsection{Subsection}
\subsubsection{Subsubsection}

\xxx{Xxx}

c:\sectionheadcoupling{subsubsection}          s:\sectionheadsection{subsubsection}          \par
c:\sectionheadcoupling{xxx}                    s:\sectionheadsection{xxx}                    \par
c:\namedheadparameter{subsubsection}{coupling} s:\namedheadparameter{subsubsection}{section} \par
c:\namedheadparameter{xxx}{coupling}           s:\namedheadparameter{xxx}{section}           \par

\stoptext
