--- /dev/null
+\chapter{The Web Browser CGI Interface}\label{webinterface}\index{Web Interface}%
+\setheader{{\it CHAPTER \thechapter}}{}{}{}{}{{\it CHAPTER \thechapter}}%
+\setfooter{\thepage}{}{}{}{}{\thepage}%
+
+\section{Overview}\index{Web Interface,Overview}%
+The CGI program {\tt ctsim.cgi} takes projections of a standard
+phantom object, performs reconstruction, and then compares the
+rasterized phantom object with the reconstruction. The comparison is
+performed both visually by an image subtraction as well as by standard
+statistics as described by Herman\cite{HERMAN80}.
+
+\section{Requirements}\index{Web Interface,Requirements}%
+ \begin{itemize}\itemsep=0pt
+ \item Apache or other CGI compatible web server
+
+ \item Perl (version 4.0 or higher)
+
+ \item A client web browser than can display PNG files. Most
+ current web browsers support PNG.
+ \end{itemize}