\documentclass{article} \usepackage[def=lmacs_tst]{lmacs} \begin{document} \section{Introduction} The {\myCoolPkg} is designed to clean up the preamble of a source file. For this file, we have \begin{verbatim} \usepackage[def=lmacs_tst]{lmacs} \end{verbatim} The preamble definitions are in the file \texttt{lmacs\_tst.def}. For this demo file, the only definition in \texttt{lmacs\_tst.def} in that of \texttt{\string\myCoolPkg}. The \texttt{@} character has the catcode of a letter, since the file is input via \texttt{\string\usepackage}. \end{document}