\newcommand{\file}[1]{\begin{small}\texttt{#1}\end{small}}
\newcommand{\program}[1]{\textbf{#1}}
\newcommand{\option}[1]{\textit{#1}}


\newenvironment{keywords}{%
      \list{}{\advance\topsep by0.35cm\relax\normalsize
      \leftmargin=1cm
      \labelwidth=\z@
      \listparindent=\z@
      \itemindent\listparindent
      \rightmargin\leftmargin}\item[\hskip\labelsep
                                    \fontfamily{phv}\selectfont\bfseries\small\keywordsname]}
    {\endlist}
