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+
+                talk.cls -- A LaTeX class for presentations
+
+
+
+Abstract
+========
+
+The talk document class allows you to create slides for screen
+presentations or printing on transparencies. It also allows you to print
+personal notes for your talk. You can create overlays and display structure
+information (current section / subsection, table of contents) on your slides.
+The main feature that distinguishes talk from other presentation classes like
+beamer or prosper is that it allows the user to define an arbitrary
+number of slide styles and switch between these styles from slide to
+slide. This way the slide layout can be adapted to the slide content. For
+example, the title or contents page of a talk can be given a slightly different
+layout than the other slides.
+
+The talk class makes no restrictions on the slide design whatsoever. The entire
+look and feel of the presentation can be defined by the user. The style
+definitions should be put in a separate sty file. Currently the package comes
+with only one set of pre-defined slide styles (greybars.sty). Contributions
+from people who are artistically more gifted than me are more than welcome!
+
+
+Requirements
+============
+
+The talk class requires the packages
+
+        amsmath,
+        graphicx,
+        pgf,
+        multido,
+        hyperref.
+
+They can all be obtained from http://www.ctan.org. For further documentation see
+talkdoc.pdf.
+
+
+License
+=======
+
+This material is subject to the LaTeX Project Public License. See
+
+        http://www.ctan.org/tex-archive/help/Catalogue/licenses.lppl.html
+
+for the details of that license.
+
+
+Changes
+=======
+
+
+v. 1.0.1:
+
+- Typesetting slides in minipages now, thus allowing for footnotes.
+
+- Added commands for changing colours in greybars.sty. Thus renamed greybars
+  to sidebars.
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+%% talkdoc -- (talkdoc.tex) documentation
+%% The documentation for the talk class
+%% Author: Martin Wiebusch
+%%
+%% This file may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%% The latest version of this license is in
+%%    http://www.latex-project.org/lppl.txt
+%% and version 1.3 or later is part of all distributions of LaTeX
+%% version 2003/12/01 or later.
+
+\documentclass[12pt]{ltxdoc}
+\usepackage[small,bf]{caption}
+\usepackage{mdwtab}\setlength{\doublerulesep}{0pt}
+
+\addtolength{\oddsidemargin}{0.5in}
+
+\newcommand{\ccmd}[1]{\texttt{\symbol{`\\}\symbol{`@}#1}}
+
+\newcommand{\mref}[2]{\textsl{#1\space\ref{#2}}}
+\newcommand{\mrefs}[1]{\textsl{#1}}
+
+\newcommand{\pkg}[1]{\textsf{#1}}
+\newcommand{\var}[1]{\textrm{$\langle$\textit{#1}$\rangle$}}
+\newcommand{\txt}[1]{\textrm{#1}}
+
+\setlength{\parskip}{\medskipamount}
+
+\renewenvironment{quote}{\list{}{\leftmargin\parindent}\item[]}{\endlist}
+
+\title{The \pkg{talk} Document Class\thanks{This file has version number 1.0,
+    last revised 2005/08/09}}
+\author{Martin Wiebusch}
+
+\sloppy
+
+\begin{document}
+\maketitle
+\begin{abstract}
+  The \pkg{talk} document class allows you to create slides for screen
+  presentations or printing on transparencies. It also allows you to print
+  personal notes for your talk. You can create overlays and display structure
+  information (current section / subsection, table of contents) on your slides.
+  The main feature that distinguishes \pkg{talk} from other presentation classes
+  like \pkg{beamer} or \pkg{prosper} is that it allows the user to define an
+  arbitrary number of \emph{slide styles} and switch between these styles from
+  slide to slide. This way the slide layout can be adapted to the slide
+  content. For example, the title or contents page of a talk can be given a
+  slightly different layout than the other slides.
+
+  The \pkg{talk} class makes no restrictions on the slide design whatsoever. The
+  entire look and feel of the presentation can be defined by the user. The style
+  definitions should be put in a separate sty file. Currently the package comes
+  with only one set of pre-defined slide styles (sidebars.sty). Contributions
+  from people who are artistically more gifted than me are more than welcome!
+\end{abstract}
+\newpage
+\tableofcontents
+%
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\section{Installation and Requirements}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+%
+The \pkg{talk} class requires the packages \pkg{amsmath}, \pkg{graphicx},
+\pkg{pgf}, \pkg{multido} and \pkg{hyperref}. They can all be obtained from
+\begin{quote}
+  |http://www.ctan.org|.
+\end{quote}
+
+To install the \pkg{talk} class, you have to copy the files |talk.cls| and
+|sidebars.sty| to a place where \LaTeX\ can find them.
+%
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\section{Using \pkg{talk}}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+%
+The usage of the \pkg{talk} class is almost independent of the chosen style
+definitions. Therefore style definitions are most conveniently included through
+separate \emph{style packages}. Currently \pkg{talk} comes with one such file
+called |sidebars.sty|. (I hope that in the future the number of available style
+packages will grow due to contributions from people that are artistically more
+gifted than I am.) The issue of writing your own style definitions is discussed
+in \mref{section}{sec:styles}. In this section we will see how to create a
+presentation using the \pkg{talk} class and some ready-to-use style package like
+|sidebars.sty|.
+
+\begin{figure}
+  \begin{quote}
+    |\documentclass[|\var{options}|]{talk}|\\
+    |\usepackage{|\var{style-def}|}|\\
+    $\vdots$\\
+    \txt{(more package inclusions)}\\
+    $\vdots$\\
+    |\title{|\var{title}|}|\\
+    |\author{|\var{author}|}|\\
+    |\date{|\var{date}|}|\\
+    $\vdots$\\
+    \txt{(global specifications required by \var{style-def})}\\
+    $\vdots$\\
+    |\begin{document}|\\
+    |  \begin{slide}[|\var{slide-style}|]{|\var{slide-title}|}|\\
+    |    |\txt{(body of first slide)}\\
+    |  \end{slide}|\\
+    |  \begin{notes}|\\
+    |    |\txt{(notes on first slide)}\\
+    |  \end{notes}|\\
+    |  |$\vdots$\\
+    |  |\txt{(more slides and notes)}\\
+    |  |$\vdots$\\
+    |  \section[|\var{short title}|]{|\var{long title}|}|\\
+    |  |$\vdots$\\
+    |  |\txt{(more slides and notes)}\\
+    |  |$\vdots$\\
+    |  \subsection[|\var{short title}|]{|\var{long title}|}|\\
+    |  |$\vdots$\\
+    |  |\txt{(more slides and notes)}\\
+    |  |$\vdots$\\
+    |  |\txt{(more sections and subsections)}\\
+    |  |$\vdots$\\
+    |\end{document}|
+  \end{quote}
+  \caption{\label{fig:structure} The general structure of a presentation
+    \texttt{tex} file.}
+\end{figure}
+The general structure of a presentation |tex| file is shown in
+\mref{figure}{fig:structure}. Note that you can structure your talk in the
+usual way with |\section| and |\subsection| commands. How these commands are
+handled depends on the loaded style package.
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Class Options}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+\label{ssec:options}
+The \pkg{talk} class is loaded in the first line of the listing in
+\mref{figure}{fig:structure}:
+\begin{quote}
+  |\documentclass[|\var{options}|]{talk}|
+\end{quote}
+The available options are
+\begin{center}
+  |screen|, |slides|, |notes|, |rotate| and |norotate|.
+\end{center}
+The \pkg{talk} class is built upon the |article| class, so it will pass all
+unknown options to |article|. Thus, in principle, all options of the |article|
+class can be used with the \pkg{talk} class as well. However, some options like
+|twocolumn| etc.\ may lead to undesired results.
+
+The options |screen|, |slides| and |notes| determine the \emph{mode}
+in which your presentation is compiled. The options |rotate| and
+|norotate| only take effect in the |slides| mode.
+
+\DescribeMacro{screen}
+Use the |screen| mode to create a screen presentation. With this option
+the paper size is set to the slide size, so that your slides can be displayed
+without white margins using the fullscreen mode of your favorite document
+viewer.
+
+\DescribeMacro{slides\\rotate\\norotate}
+If you use the |slides| mode your presentation is prepared for printout on
+transparencies. The slides are centered horizontally and vertically on normal
+paper. The default paper size is A4, but you can change it by using any of the
+paper size options of the |article| class. The options |rotate| and
+|norotate| determine whether or not the slides are rotated by 90 degrees in
+counterclockwise direction. By default rotation is enabled.
+\DescribeMacro{\slidesmag}
+In |slides| mode the slides can also be magnified. You can set the magnification
+factor with
+\begin{quote}
+  |\slidesmag{|\var{factor}|}|.
+\end{quote}
+
+\DescribeMacro{notes}
+The |notes| mode allows you to print personal notes for your presentation. In
+this mode the slides are inserted in the flowing text, between your annotations.
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Style Packages and Slide Styles}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+Style definitions for the \pkg{talk} class are most conveniently included
+through a separate \emph{style package}. Style packages can be included with the
+usual |\usepackage| command:
+\begin{quote}
+  |\usepackage[|\var{package-options}|]{|\var{style-package}|}|.
+\end{quote}
+The available package options depend on the chosen style package. The principal
+task of a \pkg{talk} style package is to set the width and height of the slides
+and define a number of \emph{slide styles}. To identify the different slide
+styles, the style package should give them \emph{style names} like |title|,
+|framed|, |sidebar|, |plain|, etc.  \DescribeMacro{\slidestyle} To switch
+between different slide styles you can use the command
+\begin{quote}
+  |\slidestyle{|\var{style-name}|}|.
+\end{quote}
+To change the slide style for only one slide you can pass a style name as an
+optional argument to the |slide| or |multislide| environment.
+
+\DescribeMacro{sidebars} The |sidebars| package has one option, |compress|,
+which affects the way in which the table of contents is displayed in the
+sidebar. It defines three slide styles called |plain|, |outline| and
+|normal|. The |plain| style has no decorations at all and can be used for the
+title page or for showing large pictures. The |outline| style is designed to
+show the structure of your talk. Use it, for example, for the contents page.
+The |normal| style should be used for all other slides. It has a sidebar showing
+the structure of your talk. The current section is highlighted.
+
+\DescribeMacro{\backgroundcolor}%
+\DescribeMacro{\sidebarcolor}%
+\DescribeMacro{\titlecolor}%
+\DescribeMacro{\sidebartitlecolor}%
+\DescribeMacro{\highlightcolor}%
+Colours can be set with the commands listed in \mref{table}{tab:colorcmds}.
+their syntax is
+\begin{quote}
+  |\|\var{color-command}|{|\var{red-value}|,|\var{green-value}|,|%
+     \var{blue-value}|}|
+\end{quote}
+where \var{color-command} is one of the commands listed in
+\mref{table}{tab:colorcmds} and \var{red-value}, \var{green-value} and
+\var{blue-value} are numbers between 0 and 1.
+\begin{table}
+  \centering
+  \begin{tabular}{lp{3in}}
+    \hlx{hhv[1pt]}
+    Command & Effect \\
+    \hlx{hv[1pt]}
+    |\backgroundcolor|   & sets the colour of the slide background\\
+    |\sidebarcolor|      & sets the colour of the sidebar\\
+    |\titlecolour|       & sets the colour of the slide title\\
+    |\sidebartitlecolor| & sets the colour of the sidebar title\\
+    |\highlightcolor|    & sets the colour of highlighted sections and
+                           subsections in the sidebar\\
+    \hlx{hh}
+  \end{tabular}
+  \caption{\label{tab:colorcmds}The colour commands of the \pkg{sidebars}
+    package}
+\end{table}
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Global Specifications}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+\DescribeMacro{\title}\DescribeMacro{\author}\DescribeMacro{\date}
+Like the |article| class, \pkg{talk} allows you to specify the title, author
+and date of your talk with the commands
+\begin{quote}
+  |\title{|\var{title}|}|\\
+  |\author{|\var{author}|}|\\
+  |\date{|\var{date}|}|
+\end{quote}
+However, individual style packages may define addtitional commands, that allow
+you to specify additional information like institute, logo, place where the talk
+was given etc.
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Environments}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+The \pkg{talk} class defines three environments: |slide|, |multislide| and |notes|.
+All typeset material in your talk should be enclosed in one of these
+environments.
+
+\DescribeMacro{slide}
+The |slide| environment is the most important environment in the \pkg{talk} class.
+It allows you to typeset the contents of your slides. Its syntax is:
+\begin{quote}
+  |\begin{slide}[|\var{style-name}|]{|\var{slide-title}|}|\\
+  |  |\txt{(slide body)}\\  |\end{slide}|
+\end{quote}
+The \var{style-name} argument is optional. It must be the name of one of the
+slide styles defined in style package you have loaded. For the |sidebars|
+package the available slide styles are |plain|, |outline| and |normal|. If no
+\var{style-name} argument is given, \pkg{talk} uses the slide style specified in
+the last call of the |\slidestyle| command.
+
+\DescribeMacro{notes}
+The |notes| environment allows you to include annotations to your slides in
+the |tex| file. The contents of the |notes| environment are ignored if you
+compile your presentation in the |screen| or |slides| mode.
+
+\DescribeMacro{multislide}
+The |multislide| environment can be used to create overlays. Its syntax is:
+\begin{quote}
+  |\begin{multislide}[|\var{style-name}|]{|\var{sub-slides}|}|%
+                                        |{|\var{slide-title}|}|\\
+  |  |\txt{(slide body)}\\
+  |\end{multislide}|
+\end{quote}
+As for the |slide| environment the optional \var{style-name} argument and the
+\var{slide-title} argument specify the slide style and the slide title. The
+\var{sub-slides} argument has to be an integer number greater than zero. It
+specifies the number of sub-slides, that the |multislide| environment will
+generate. In the body of the |multislide| environment, you can use the commands
+|\fromslide|, |\toslide| and |\onlyslide| to specify which material goes on
+which sub-slide. 
+
+\DescribeMacro{\fromslide}\DescribeMacro{\toslide}\DescribeMacro{\onlyslide}
+The syntax of the commands |\fromslide|, |\toslide| and |\onlyslide| is:
+\begin{quote}
+  |\fromslide*{|$n$|}{|\var{material}|}|\\
+  |\toslide*{|$n$|}{|\var{material}|}|\\
+  |\onlyslide*{|$n$|}{|\var{material}|}|
+\end{quote}
+The |\fromslide*| command ignores \var{material} on the first $n-1$ sub-slides.
+The |\toslide*| command ignores \var{material} on all sub-slides after the
+$n$-th. The |\onlyslide*| command ignores \var{material} on all sub-slides exept
+the $n$-th. If you use the unstarred commands |\fromslide|, |\toslide| and
+|\onlyslide| the \var{material} is not ignored but made invisible, so that it
+still uses up the space (pretty much like the |\phantom| command).
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Title and Contents Pages}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+\label{sec:toc}
+Most talks begin with a title page showing the title of the talk, the name of
+the speaker and possibly additional information like the date and place where
+the talk is given, the institute of the speaker etc. For long talks you'll also
+want to show the stucture of your talk at the beginning.
+
+\DescribeMacro{\maketitle}\DescribeMacro{\tableofcontents}
+Style packages for the \pkg{talk} class should therefore redefine the standard
+\LaTeX\ commands |\maketitle| and |\tableofcontents| in such a way that they
+produce suitable title and contents pages. These commands should be used in the
+body of a slide environment. For example, with the |sidebars| style package
+you would create title and contents pages by writing
+\begin{quote}
+  |\begin{slide}[plain]{}|\\
+  |  \maketitle|\\
+  |\end{slide}|
+\end{quote}
+and
+\begin{quote}
+  |\begin{slide}[outline]{Contents}|\\
+  |  \tableofcontents|\\
+  |\end{slide}|
+\end{quote}
+
+For some talks the table of contents may not fit on one slide. The \pkg{talk}
+class cannot break material into multiple slides automatically, but it allows
+you to split the table of contents manually.  To do this you can pass an
+optional argument to the |\tableofcontents| command, which has the following
+form:
+\begin{quote}
+  |\tableofcontents[|\var{fromsec}|.|\var{fromsubsec}%
+                  |-|\var{tosec}|.|\var{tosubsec}|]|
+\end{quote}
+where \var{fromsec}, \var{fromsubsec}, \var{tosec} and \var{tosubsec} are
+integer numbers. Their names are self-explaining. Note that the argument of
+|\tableofcontents| must always have the form given above. If you wan to display
+the sections 3 to 5 with all their subsections on one slide, you have to write
+\begin{quote}
+  |\tableofcontents[3.0-5.99]|
+\end{quote}
+(assuming that section 5 does not have more than 99 subsections).
+%
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\section{The \pkg{talk} Class for Package Writers}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+%
+\label{sec:styles}
+The entire look-and-feel of a \pkg{talk} presentation is determined by external
+style packages. The macros provided by the \pkg{talk} class itself only take
+care of more technical issues like
+\begin{itemize}
+  \item magnifying and positioning the slides on the paper,
+  \item creating overlays,
+  \item keeping a table of contents that is accessible on every slide,
+  \item keeping a catalog of slide styles and allowing the user to switch
+    between them.
+\end{itemize}
+To exploit these features, a style package writer needs to know some basic facts
+about the inner workings of the \pkg{talk} class.
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Mode Conditionals}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+As we have seen in \mref{section}{ssec:options} a \pkg{talk} presentation can be
+compiled in three different modes: |slides|, |screen| and |notes|. To implement
+mode-specific behaviour the \pkg{talk} class provides the following |if|
+commands:
+\DescribeMacro{\@ifslides}\DescribeMacro{\@ifscreen}\DescribeMacro{\@ifnotes}
+\begin{quote}
+  |\@ifslides{|\var{if-code}|}{|\var{else-code}|}|\\
+  |\@ifscreen{|\var{if-code}|}{|\var{else-code}|}|\\
+  |\@ifnotes{|\var{if-code}|}{|\var{else-code}|}|
+\end{quote}
+The \var{if-code} is executed if the talk is compiled in |slides|, |screen| or
+|notes| mode, respectively, and the \var{else-code} is executed otherwise.
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Slide Dimensions}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+\DescribeMacro{\slidewidth}\DescribeMacro{\slideheight}
+The width and height of the slides can be accessed through the |\slidewidth| and
+|\slideheight| commands.
+\DescribeMacro{\@slidesize}
+However, to set the slide dimensions you should always use the command
+\begin{quote}
+  |\@slidesize{|\var{width}|}{|\var{height}|}|
+\end{quote}
+as it also adjusts the papersize and slide positioning.
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Global Specifications}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+\DescribeMacro{\@title}\DescribeMacro{\@author}\DescribeMacro{\@date}
+The title, author and date set by the user with the |\title|, |\author| and
+|\date| commands are stored in the macros |\@title|, |\@author| and |\@date|.
+If you intend to display additional information like the speakers institute on
+your slides you should define an |\institute| command in analogy to the commands
+above:
+\begin{quote}
+  |\gdef\@institute{}|\\
+  |\newcommand{\institute}[1]{\gdef\@institute{#1}}|
+\end{quote}
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Counters}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+\DescribeMacro{slide\\subslide}
+In addition to the standard counters of the |article| class, \pkg{talk} defines
+the counters |slide| and |subslide|. The number of the current slide is stored
+in |slide|. The slides of a |multislide| environment have the same |slide|
+number and different |subslide| numbers.
+
+\DescribeMacro{\theslide}\DescribeMacro{\thesubslide}%
+The commands |\theslide| and |\thesubslide| can be used to print the slide or
+subslide number, respectively. They are defined as
+\begin{quote}
+  |\newcommand{\theslide}{\arabic{slide}}|\\
+  |\newcommand{\thesubslide}{\theslide.\arabic{subslide}}|
+\end{quote}
+You can redefine them to change the way the slide and subslide numbers
+are displayed
+
+\DescribeMacro{\theslidelabel}
+For printing labels on your slides you should use the |\theslidelabel|
+command. It calls |\theslide| when you are in a |slide| environment and
+|\thesubslide| when you are in a |multislide| environment. 
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Style Definitions}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+To change the look-and-feel of your slides you have to redefine some or all of
+the following commands:
+\begin{quote}
+  |\@makeslide|\\
+  |\@makeslidebackground|\\
+  |\@makeslidecontent|\\
+  |\@makenotesslide|\\
+  |\@maketocsection|\\
+  |\@maketocsubsection|
+\end{quote}
+These commands will be called by the |slide|, |multislide| and |notes|
+environments. Their exact meaning will be explained later on.
+\DescribeMacro{\@newslidestyle}
+To create a \emph{named} slide style, you have to wrap a |\@newslidestyle|
+command around your definitions. A typical style definition takes the form
+\begin{quote}
+  |\@newslidestyle{|\var{style-name}|}{|\\
+  |  \renewcommand{\@makeslide}{|\var{stuff}|}|\\
+  |  \renewcommand{\@makeslidebackground}{|\var{stuff}|}|\\
+  |  \renewcommand{\@makeslidecontent}{|\var{stuff}|}|\\
+  |  \renewcommand{\@makenotesslide}{|\var{stuff}|}|\\
+  |  \renewcommand{\@maketocsection}[3]{|\var{stuff}|}|\\
+  |  \renewcommand{\@maketocsubsection}[4]{|\var{stuff}|}|\\
+  |}|
+\end{quote}
+
+The |\@newslidestyle| command simply dumps its second argument into a macro
+called |\pres@sty@|\var{style-name}. When the style is loaded
+with |\slidestyle{|\var{style-name}|}| or with the optional argument of the
+|slide| environment, all the |\@make|\ldots\ commands are reset to their default
+definitions. Then the macro |\pres@sty@|\var{style-name} is executed.
+
+Note that the |\renewcommand| calls in the second argument of |\@newslidestyle|
+appear in the definition of the |\pres@sty@|\var{style-name} command. Therefore
+the arguments of |\@maketocsection| and |\@maketocsubsection| have to be
+referenced with double hashes, for example
+\begin{quote}
+  |\@newslidestyle{|\var{style-name}|}{|\\
+  |  \renewcommand{\@maketocsection}[3]{Section ##1: ##3}|\\
+  |}|  
+\end{quote}
+Single hashes would refer to the arguments of |\pres@sty@|\var{style-name}.
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Typesetting Slides}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+\DescribeMacro{\@slidetitle}\DescribeMacro{\@slidebody}
+The |slide| and |multislide| environments store the slide title in the macro
+|\@slidetitle| and the slide body in the macro |\@slidebody|. When you redefine
+the various |\@make|\ldots\ commands you can therefore use |\@slidetitle| and
+|\@slidebody| to insert the title and body of the current slide.
+
+\DescribeMacro{\@makeslide}
+In the |screen| or |slides| mode the |slide| and |multislide| environments call
+the |\@makeslide| command, which should produce an LR box of width |\slidewidth|
+and height |\slideheight| that contains the actual slide. In the |slides| mode
+the output of |\@makeslide| is centered on the page and scaled by the factor
+specified in the last call of the |\slidesmag| command. If the |rotate| option
+is enabled it is also rotated by 90 degrees in the counterclockwise direction.
+
+\DescribeMacro{\@makenotesslide}
+If you compile in the |notes| mode the |slide| and |multislide| environments
+call |\@makenotesslide| to insert the current slide. By default the
+|\@makenotesslide| command simply centers the output of |\@makeslide|
+horizontally:
+\begin{quote}
+  |\newcommand{\@makenotesslide}{|\\
+  |  \par\hspace*{\fill}\@makeslide\hspace*{\fill}\par|\\
+  |}|
+\end{quote}
+You can change this behaviour by redefining the |\@makenotesslide| command. For
+example, if you only want to print the title of each slide in your notes, you
+should include something like
+\begin{quote}
+  |\renewcommand{\@makenotesslide}{|\\
+  |  \begin{center}\textbf{\@slidetitle}\end{center}|\\
+  |}|
+\end{quote}
+in your style definition.
+
+To change the way the slides appear in the |screen| and |slides| mode you could
+redefine the |\@makeslide| command. However, usually you'll want to draw the
+slide background with some graphics package like \pkg{pgf} and then typeset the
+contents of the slide in a parbox of width |\slidewidth| and height
+|\slideheight| placed on top of that picture.
+\DescribeMacro{\@makeslidebackground}\DescribeMacro{\@makeslidecontent} The
+\pkg{talk} class faciliates this task by allowing you to customise the commands
+|\@makeslidebackground| and |\@makeslidecontent|. The default definition for
+|\@makeslide| is
+\begin{quote}
+  |\newcommand{\@makeslide}{|\\
+  |  \begin{pgfpicture}{0pt}{0pt}{0pt}{0pt}|\\
+  |    \@makeslidebackground|\\
+  |  \end{pgfpicture}|\\
+  |  \parbox[b][\slideheight][t]{\slidewidth}{|\\
+  |    \@makeslidecontent|\\
+  |  }|\\
+  |}|
+\end{quote}
+Thus the |\@makeslidebackground| macro should expand to a series of \pkg{pgf}
+commands that draw the background of the slide. Note that the origin of the
+\pkg{pgf} coordinate system is at the lower left-hand corner of the slide. The
+|\@makeslidecontent| macro should expand to whatever you want to put in the
+parbox. Here, you start with the current point in the upper left corner of the
+slide.
+
+In this way \pkg{talk} gives you complete artistic freedom in the design of your
+slides: It lets you define the macros that generate the slides while contents
+like the slide title and body are previously stored in macros like
+|\@slidetitle| and |\@slidebody|, so that you can insert them where you
+like. For completeness we now summarise all commands yielding user defined
+contents:
+\begin{description}
+  \item[\ccmd{slidetitle}] Title of the current slide.
+  \item[\ccmd{slidebody}] Body of the current slide.
+  \item[\texttt{\symbol{`\\}theslidelabel}] Label of the current slide. Shows
+    the slide number in a |slide| environment and the slide and subslide number
+    in a |multislide| environment.
+  \item[\ccmd{title}] Title of the presentation.
+  \item[\ccmd{author}] Author of the presentation.
+  \item[\ccmd{date}] Date specified with the |\date| command (|\today| by
+    default).
+  \item[\ccmd{tableofcontents}] Prints the table of contents. See the next
+    subsection for more information.
+\end{description}
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{The Table of Contents}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+\DescribeMacro{\@tableofcontents}
+The table of contents of your talk can be created with the |\@tableofcontents|
+macro. Its name is slightly misleading because, in fact, it allows you to
+display any kind of structure information on your slides. For example, you can
+use it to print only the title of the current section. 
+
+\DescribeMacro{\@maketocsection}\DescribeMacro{\@maketocsubsection}
+The |\@tableofcontents| macro expands to a series of |\@maketocsection| and
+|\@maketocsubsection| commands. By default these commands do nothing. You can
+control the appearence of the table of contents by redefining them. Their syntax
+is
+\begin{quote}
+  |\@maketocsection{|\var{section}|}{|\var{short-title}|}{|\var{long-title}|}|
+  \\[\medskipamount]
+  |\@maketocsubsection{|\var{section}|}{|\var{subsection}|}%|\\
+  |                   {|\var{short-title}|}{|\var{long-title}|}|
+\end{quote}
+where \var{section} and \var{subsection} are integer numbers.
+
+\DescribeMacro{\@ifcurrentsection}\DescribeMacro{\@ifcurrentsubsection}
+Note that the |\@tableofcontents| macro always expands to the full list of
+sections and subsections. To implement a special treatment for the
+\emph{current} section or subsection you can use the |\@ifcurrentsection| and
+|\@ifcurrentsubsection| commands. Their syntax is
+\begin{quote}
+  |\@ifcurrentsection{|\var{number}|}{|\var{if-code}|}{|\var{else-code}|}|\\
+  |\@ifcurrentsubsection{|\var{number}|}{|\var{if-code}|}{|\var{else-code}|}|
+\end{quote}
+The \var{if-code} is executed if \var{number} matches the current section or
+subsection, respectively, and \var{else-code} is executed otherwise. For
+example, if you want to display the current section in the top left corner of
+each slide, your style definition should look somewhat like
+\begin{quote}
+  |\newslidestyle{|\var{style-name}|}{|\\
+  |  \renewcommand{\@maketocsection}[3]{|\\
+  |    \@ifcurrentsection{##1}{##3}{}|\\
+  |  }|\\
+  |  \renewcommand{\@makeslidecontent}{|\\
+  |    \@tableofcontents|\\
+  |    |$\vdots$\\
+  |  }|\\
+  |  |$\vdots$\\
+  |}|
+\end{quote}
+
+\DescribeMacro{\tableofcontents}
+Most talks begin with an outline of the talk's contents. As a package writer you
+should therefore provide a |\tableofcontents| command that allows the user to
+print the full table of contents. (\pkg{talk} already defines the
+|\tableofcontents| command, but it does nothing by default.) You can achieve
+this, too, by redefining |\@maketocsection| and |\@maketocsubsection| and then
+calling |\@tableofcontents|.
+
+\DescribeMacro{\@ifinrange}
+However, if the table of contents does not fit on one slide, the user should be
+able to split it, using an optional range argument of the form shown in
+\mref{section}{sec:toc}. It is the package writers task to implement this
+feature, but the parsing of the range argument is done by the |\@ifinrange|
+macro. Its syntax is
+\begin{quote}
+  |\@ifinrange{|\var{sec}|}{|\var{subsec}|}{|\var{range}|}{|\var{if-code}|}{|\var{else-code}|}|
+\end{quote}
+\var{sec} and \var{subsec} are section and subsection numbers and \var{range} is
+a string of the form
+\begin{quote}
+  \var{fromsec}|.|\var{fromsubsec}|-|\var{tosec}|.|\var{tosubsec}
+\end{quote}
+The \var{if-code} is executed if the subsection specified by \var{sec} and
+\var{subsec} lies in the range specified by \var{range}, the \var{else-code} is
+executed otherwise.
+
+A typical definition of the |\tableofcontents| command will therefore look as
+follows:
+\begin{quote}
+  |\renewcommand{\tableofcontents}[1][0.0-99.99]{|\\
+  |  \bgroup|\\
+  |  \def\@maketocsection##1##2##3{|\\
+  |    \@ifinrange{##1}{0}{#1}{|\\
+  |      ##1.\space ##3\par|\\
+  |    }{}|\\
+  |  }|\\
+  |  \def\@maketocsubsection##1##2##3##4{|\\
+  |    \@ifinrange{##1}{##2}{#1}{|\\
+  |      ##1.##2.\space ##3\par|\\
+  |    }{}|\\
+  |  }|\\
+  |  \@tableofcontents|\\
+  |  \egroup|\\
+  |}|
+\end{quote}
+If you use grouping (|\bgroup| and |\egroup| or curly brackets) and plain \TeX\
+definitions (|\def| instead of |\renewcommand|), as shown above, your
+definitions remain local to the goup, so you don't have to worry about restoring
+the original definitions of |\@maketocsection| and |\@maketocsubsection|. A more
+sophisticated definition of the |\tableofcontents| command can be found in
+|sidebars.sty|.
+\newpage
+%
+%
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\section{Contact}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+%
+For comments, bug reports, feature requests or submitting style packages please
+email to
+\begin{quote}
+  |martin.wiebusch@gmx.net|
+\end{quote}
+
+\bigskip
+\begin{flushright}
+  Martin Wiebusch, 31.07.2005
+\end{flushright}
+\end{document}
+
+