%% 
%%  A DANTE-Edition example
%% 
%%  Beispiel 02-17-1 auf Seite 85.
%% 
%%  Copyright (C) 2010 H. Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

%%Run also: >>  << 
% Show page(s) 1

\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{170.59192pt}
\setlength\parindent{0pt}

\usepackage{booktabs}\usepackage{tabularkv}

\begin{document}
\fbox{\begin{tabularkv}[width=2.3in,height=0.7in,
  valign=center]{@{}l@{\extracolsep{\fill}}r@{}}
  Oben Links & Oben Rechts \\\interrowfill
  \multicolumn{2}{@{}c@{}}{%
              bounding box}\\\interrowfill
  Unten Links & Oben Rechts
\end{tabularkv}}
\end{document}