\documentclass{ppex}
\nonstopmode
\usepackage [frame]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [frame]{xy}
\[\begin{xy}
 (0,0)*@{o}*!UL{Box1}*\frm{-}*@{x}
,(20,0)*@{o}*!RD{Box2}*\frm{-}*@{x}
\end{xy}\]
\end{document}

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