%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example A-2-20 on page 869.
%%
%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
%%    Johannes Braams, David Carlisle, and Chris Rowley
%%
%% 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.
%%

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{111.0pt}
\StartShownPreambleCommands
\usepackage{calc}
\newsavebox{\fcolbox} \newlength{\fcolwidth}
\newenvironment{fcolumn}[1][\linewidth]
  {\setlength{\fcolwidth}{#1-2\fboxsep-2\fboxrule}%
   \begin{lrbox}{\fcolbox}\begin{minipage}{\fcolwidth}}
  {\end{minipage}\end{lrbox}\noindent\fbox{\usebox{\fcolbox}}}
\StopShownPreambleCommands
\begin{document}
\begin{fcolumn}   In this environment verbatim text like
  \verb=\fcolbox= can be used.                  \end{fcolumn}
\end{document}