\topmargin -.25in \headheight 0pt \headsep 0pt \footheight 0pt \footskip 0pt \textheight 9.3125in 
\oddsidemargin -.2in \evensidemargin -.2in \textwidth 6.9in \columnsep .3333in \columnseprule 0pt
% ACM specs suggest a textwidth of 7.0 and sidemargins of -.25,
% but LaTeX and my Laserwriter need the fudged values above to comply.

\def\@oddhead{}\def\@evenhead{}
\def\@oddfoot{}\def\@evenfoot{}

\def\maketitle{\par
 \begingroup
 \def\thefootnote{\fnsymbol{footnote}}
 \def\@makefnmark{\hbox 
 to 0pt{$^{\@thefnmark}$\hss}} 
 \twocolumn[\@maketitle] 
 \@thanks
 \endgroup
 \setcounter{footnote}{0}
 \let\maketitle\relax
 \let\@maketitle\relax
 \gdef\@thanks{}\gdef\@author{}\gdef\@title{}\let\thanks\relax}
\def\@maketitle{\vbox to 2.4in{\hsize\textwidth 
 \linewidth\hsize \vfil \centering
 {\LARGE \@title \par} \vskip 2em {\large \begin{tabular}[t]{c}\@author
\end{tabular}\par} 
 \vfil}}

\def\copyrightspace{\insert\footins{\footnotesize
    \interlinepenalty\interfootnotelinepenalty 
    \splittopskip\footnotesep
    \splitmaxdepth \dp\strutbox \floatingpenalty \@MM
    \hsize\columnwidth \@parboxrestore
    \mbox{}\vrule height 1in width 0pt
    {\rule{\z@}{\footnotesep}\ignorespaces\strut}}}

\def\abstract{\section*{Abstract}}
\def\endabstract{\par}
\twocolumn 
\sloppy
\parindent 1em
\leftmargini 2em
\leftmargin\leftmargini 
\leftmarginv .5em
\leftmarginvi .5em
\flushbottom