%%  A LaTeX2e class for doing INTERACT conference proceedings.
%%
%%  Copyright (c) 1999, Russel Winder
%%  Revisions April 1999 for Volume II, Alison Cawsey
%%
\def \fileversion{v1.3}
\def \filedate{1999/01/15}
\def \docdate{\filedate}
%
%  Essentially a standard looking LaTeX2e document with a few preamble
%  additions:
%
%  \documentclass{interact_vol2}
%  \usepackage{rnmdt}  %%  Remove if not using BibTeX.
%  \title{...}
%  \author{...}
%  \address{...}
%  \telephone{...}
%  \fax{...}
%  \email{...}
%  \url{...}
%  \keywords{...}
%  \begin{document}
%  \bibliographystyle{rnmdt}  %%  Remove if not using BibTeX.
%  \maketitle
%  \begin{abstract}
%   ...
%  \end{abstract}
%  \begin{multicols}{2}
%   ...
%  {\small \bibliography{...}}  %%  Remove if not using BibTeX but note that
%                               %%  references are typeset in \small font.
%  \end{multicols}
%  \end{document}
%
%  \title{..} and \author{...} can actually appear as \title[...]{...}
%  and \author[...]{...}.  The part inside the square brackets will be
%  used for the running heads instead of the part in the curly braces
%  which is the title and author list used on the title page; this is
%  for the cases where the title and/or author list are too long to be
%  running heads, running heads can be defined explicitly.
%
%  This style is not the one used for real and, in fact, does not
%  quite replicate the formatting achieved using  the ``real''
%  macros.  I haven't had time to investigate this but really ought to
%  be cured.
%
%  The rnmdt.bst and rnmdt.sty files required for correct formatting
%  of citations should be ftp.dcs.kcl.ac.uk/pub/russel/).  Standard
%  citations use \cite{XXX} and result in (xxx, ddd) type citations.
%  If you want xxx (ddd) type citations use \citeasnoun{XXX}.
%
%  If anyone finds any errors or wants to comment on this file please
%  contact me: alison@cee.hw.ac.uk in the first instance.
%
\NeedsTeXFormat{LaTeX2e}[1997/12/01]
\ProvidesClass{interact_vol2}[\filedate\space\fileversion\space INTERACT Proceedings class]
\DeclareOption{onecolumn}{%
    \ClassError{interact_vol2}{Option `onecolumn' not permitted for this style.}{}}
\DeclareOption{twocolumn}{%
    \ClassError{interact_vol2}{Option `twocolumn' is effectively on by default.}{}}
\PassOptionsToClass{10pt,a4paper}{book}
\DeclareOption*{\PassOptionsToClass{\CurrentOption}{book}}
\ProcessOptions
\LoadClass{book}
\RequirePackage{times}
\RequirePackage{mathptm}
\RequirePackage{multicol}
\RequirePackage{a4}
\def \title{\@ifnextchar[{\@gettitletwo}{\@gettitleone}}
\def \@gettitleone#1{\@gettitletwo[#1]{#1}}
\def \@gettitletwo[#1]#2{{%
    \gdef \@title{#2}%
    \def \thanks##1{\relax}%
    \def \\{\unskip \space \ignorespaces}%
    \xdef \@titlehead{#1}%
}}
\def \author{\@ifnextchar[{\@getauthortwo}{\@getauthorone}}
\def \@getauthorone#1{\@getauthortwo[#1]{#1}}
\def \@getauthortwo[#1]#2{{%
    \global \let \latexand \and%
    \gdef \and{\space \@authorand \space \ignorespaces}%
    \gdef \@author{#2}%
    \def \and{\unskip \space \@authorand \space \ignorespaces}%
    \def \thanks##1{\relax}%
    \def \\{\unskip \space \ignorespaces}%
    \xdef \@authorhead{#1}%
    \gdef \@@author{#2}%
}}
\def \@name{}
\def \@address{}
\def \@telephone{}
\def \@fax{}
\def \@email{}
\def \@url{}
\newcommand \@contactdetails[6]{%
    \gdef \@name{#1}%
    \gdef \@address{#2}%
    \gdef \@telephone{#3}%
    \gdef \@fax{#4}%
    \gdef \@email{#5}%
    \gdef \@url{#6}%
}
\let \contactdetails \@contactdetails
\newcommand \address[1]{\gdef\@address{#1}}
\newcommand \telephone[1]{\gdef \@telephone{#1}}
\newcommand \fax[1]{\gdef \@fax{#1}}
\newcommand \email[1]{\gdef \@email{#1}}
\newcommand \url[1]{\gdef \@url{#1}}
\newcommand \keywords[1]{\gdef \@keywords{#1}}%
\renewcommand \thesection{\arabic{section}}%
\renewcommand \theequation{\arabic{equation}}%
\renewcommand \thefigure{\arabic{figure}}%
\renewcommand \thetable{\arabic{table}}%
\def \section{%
    \@ifstar{\@sectionstar}{\@sectionnostar}%
}
\def \@sectionstar#1{\@startsection{section}{1}{\z@}{-2ex \@plus -.4ex \@minus -.2ex}{1ex \@plus .1ex \@minus .1ex}{\sectionheadfont}*{\uppercase{#1}}}
\def \@sectionnostar#1{\@startsection{section}{1}{\z@}{-2ex \@plus -.4ex \@minus -.2ex}{1ex \@plus .1ex \@minus .1ex}{\sectionheadfont}{\uppercase{#1}}}
\def \subsection{\@startsection{subsection}{2}{\z@}{-1ex \@plus -.3ex \@minus 
 -.2ex}{.5ex \@plus .1ex \@minus .1ex}{\subsectionheadfont}}
\def \subsubsection{\@startsection{subsubsection}{3}{\z@}{-.75ex \@plus 
 -.2ex \@minus -.2ex}{.3ex \@plus .1ex \@minus .1ex}{\subsubsectionheadfont}}
\setcounter{secnumdepth}{3}
\newcommand \copyrightnotice{%
    \hbox to \z@{%
        \vbox to \z@{%
            \parbox{\columnwidth}{%
                Human--Computer Interaction --- INTERACT '99 (Volume II)\\%
                S. Brewster, A. Cawsey and G. Cockton (Editors)\\%
                \copyright\ IFIP, 1999%
            }%
            \vss%
        }%
        \hss%
    }%
}
\def \ps@paper{%
    \let \@mkboth \papermarkboth%
    \def \@oddhead{\rightmark}%
    \def \@oddfoot{}%
    \def \@evenhead{\leftmark}%
    \def \@evenfoot{}%
    \let \chaptermark \@gobble%
    \let \sectionmark \@gobble%
}
\def \ps@papertitlepage{%
    \let \@mkboth \papermarkboth%
    \def \@oddhead{\small \itshape \copyrightnotice \hfill \thepage}%
    \def \@oddfoot{}%
    \def \@evenhead{\small \itshape \thepage \hfill \copyrightnotice}%
    \def \@evenfoot{}%
    \let \chaptermark \@gobble%
    \let \sectionmark \@gobble%
}
\let \ps@plain \ps@empty
\hyphenpenalty = \@M
\tolerance = \@m
\emergencystretch = 20\p@
\hfuzz = 2\p@
\vfuzz = 2\p@
\renewcommand \footnoterule {%
    \kern -3\p@%
    \hrule%
    \kern 2.6\p@%
}
\setlength \columnsep{8mm}%
\setlength \parskip{\z@ \@plus 1\p@}
\setlength \parindent{2em}
\setlength \headsep{16\p@}
\setlength \partopsep{1\p@ \@minus 1\p@}
\setlength \topsep{\z@}
\setlength \footskip{26\p@}
\renewcommand \topfraction{.85}
\renewcommand \textfraction{.15}
\renewcommand \floatpagefraction{.75}
\renewcommand \bibname{REFERENCES}
\renewenvironment{thebibliography}[1]{%
    \section*{\bibname}%
    \list{\@biblabel{\arabic{enumiv}}}%
         {\settowidth\labelwidth{\@biblabel{#1}}%
          \leftmargin \labelwidth%
          \advance \leftmargin \labelsep%
          \@openbib@code%
          \usecounter{enumiv}%
          \let \p@enumiv \@empty%
          \renewcommand \theenumiv{\arabic{enumiv}}}%
    \small%
    \sloppy%
    \clubpenalty 4000%
    \widowpenalty 4000%
    \sfcode `\.=\@m%
    \relax%
}{%
    \def \@noitemerr{\@latex@warning{Empty `thebibliography' environment}}%
    \endlist%
}
\newcommand \papermarkboth[2]{%
    \markboth{\noexpand \small \itshape \noexpand \thepage \hfill #1}%
             {\noexpand \small \itshape #2\hfill \noexpand \thepage}%
}
\pagestyle{paper}
\setlength \textwidth{160 true mm}
\setlength \textheight{218 true mm}

%% Revised for volume II, AC

\oddsidemargin -14mm
\evensidemargin -14mm
\topmargin -8.5mm

\newcommand \@authorand{\&}
\newlength \spaceAboveTitle
\setlength \spaceAboveTitle{5mm}
\renewcommand \maketitle{%
    \begingroup%
        \renewcommand \thefootnote{\fnsymbol{footnote}}%
        \def\@makefnmark{\rlap{\@textsuperscript{\normalfont\@thefnmark}}}%
        \long\def\@makefntext##1{\parindent 1em\noindent%
            \hb@xt@1.8em{%
                \hss\@textsuperscript{\normalfont\@thefnmark}}##1}%
        %\twocolumn[\@maketitle]%
        \@maketitle%
        \thispagestyle{papertitlepage}%
    \endgroup%
    \@mkboth{\@authorhead}{\@titlehead}%
    \setcounter{footnote}{0}%
    \global \let \thanks \relax%
    \global \let \@url \@empty%
    \global \let \@email \@empty%
    \global \let \@fax \@empty%
    \global \let \@telephone \@empty%
    \global \let \@address \@empty%
    \global \let \@authorhead \@empty%
    \global \let \@@author \@empty%
    \global \let \@author \@empty%
    \global \let \@date \@empty%
    \global \let \@title \@empty%
    \global \let \title \relax%
    \global \let \author \relax%
    \global \let \date \relax%
    \global \let \and \relax%
}

%% Bold added for volume II

\def \@maketitle{%
    \vspace*{\spaceAboveTitle}%
    \begin{center}%
        {\LARGE \bf \@title \par}%
        \vspace*{2\bigskipamount}%
        {\Large \bf \@author \par}%
        \vspace*{\medskipamount}%
        \@docontactdetails{\@address}{\@telephone}{\@fax}{\@email}{\@url}%
    \end{center}%
}
\def\@makechapterhead#1{%
    \vspace*{\spaceAboveTitle}%
    {\LARGE \begin{center} #1 \end{center}}%
    \vspace*{3\bigskipamount}%
}
\let \@makeschapterhead \@makechapterhead
\newcommand \@@contactdetails[6]{%
    \vspace*{-\medskipamount}%
    \@docontactdetails{#2}{#3}{#4}{#5}{#6}%
}
\newcommand \@docontactdetails[5]{%
    {\Large%
     #1%
     \par%
     \vspace*{\smallskipamount}%
     \setbox0 = \hbox{#2}%
     \ifdim \wd0 > \z@%
        Tel: {\large #2}\\%
     \fi%
     \setbox0 = \hbox{#3}%
     \ifdim \wd0 > \z@%
        Fax: {\large #3}\\%
     \fi%
     \setbox0 = \hbox{#4}%
     \ifdim \wd0 > \z@%
        Email: #4\\%
     \fi%
     \setbox0 = \hbox{#5}%
     \ifdim \wd0 > \z@%
        URL: #5\\%
     \fi%
    }%
    \global \let \contactdetails \@@contactdetails%
}
\newenvironment{abstract}{%
    \vspace*{\bigskipamount}%
    \let \acronym \aacronym%
    \noindent%
    \@ifnextchar{\ }{\@gobble}{}%
}{%
    \par%
    \bigskip%
    \noindent%
    Keywords: \@keywords%
    \medskip%
}
\newcommand \notsolarge {\@setfontsize\notsolarge{11}{13}}
\def \sectionheadfont{\large\bfseries}
\def \subsectionheadfont{\large\bfseries}
\def \subsubsectionheadfont{\large\bfseries}
\renewcommand \thefootnote{\fnsymbol{footnote}}%
\newcommand \acronym[1]{{\small #1}}
\newcommand \aacronym[1]{{\small\textit{#1}}}
\newcommand \facronym[1]{{\scriptsize #1}}