\documentclass{article}
\usepackage{ulem}
\pagestyle{headings}
\begin{document}
This is the sandbox.  You can try out Wiki in here, and no one will care - but don't be rude and delete this explanatory text. \textbf{Stay below the first horizontal rule.}

For reference, you might want to visit Wiki/Usage\footnote{http://example.com/index.php?page=Wiki/Usage}, Wiki/TextFormat\footnote{http://example.com/index.php?page=Wiki/TextFormat} or Wiki/AddingPages\footnote{http://example.com/index.php?page=Wiki/AddingPages}.


\noindent\rule{\textwidth}{1pt}
\end{document}