% For UNIX workstations.
\usepackage[latin1]{inputenc}

% For Macintosh.
% \usepackage[applemac]{inputenc}

\usepackage[T1]{fontenc}

\usepackage[swedish,english]{babel}

\title{Test article}
\author{Fredrik Lingvall}

\begin{document}

\maketitle

\section{\LaTeX\ is Great\ldots}

\section{Using Languages other than English---the babel package}

\selectlanguage{swedish} % Switch language.

Hej på dig\ldots

\selectlanguage{english} % Switch back.

Hi\ldots

\end{document}