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+\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}