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%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example A-3-6 on page 874.
%%
%% 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{207.0pt}
\StartShownPreambleCommands
\usepackage{ifthen}
\StopShownPreambleCommands
\begin{document}
\newcommand{\IX}[2][R]{\texttt{#2}%
  \ifthenelse{\equal{#1}{D}}%
     {\index{#2|textbf}}{\index{#2}}}
   we define item \IX[D]{AAAA}
   \ldots{}     we reference item \IX{AAAA}
\end{document}