seminar update (11jan07)

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+%%%%%%%%%%%%%%%%%%%%%%%%%%% -*- Mode: Latex -*- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% seminar.bg2 --- Corrections for compatibility problems and new bugs
+%%                 found in the Seminar package, and few new additions
+%%                 to help overlays management for PDF output files.
+%%                 (see also the seminar.bug file in Seminar distribution)
+%%
+%%                 Disclaimer: this file is mine and doesn't engage TVZ!
+%%
+%% Note: insert it after \usepackage{graphicx} if you use `graphicx'
+%%       and after \usepackage{longtable} if you use `longtable'
+%%
+%% Author          : Denis GIROU (CNRS/IDRIS - France) <Denis.Girou@idris.fr>
+%% Created the     : 1995
+%% Last mod. by    : Denis GIROU (CNRS/IDRIS - France) <Denis.Girou@idris.fr>
+%% Last mod. the   : Fri May 31 20:19:22 2002
+%%
+%% This file may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License, either version 1.2 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 1.2 or later is part of all distributions of LaTeX version
+%% 1999/12/01 or later.
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\def\FileVersion{2.1}
+\def\FileDate{May 31, 2002}
+\typeout{seminar.bg2: various corrections for the Seminar document class^^J%
+         added since seminar.bug and few add-ons for overlays^^J%
+         (Version \FileVersion\space of <\FileDate> (D.G.))}
+
+\edef\TheAtCode{\the\catcode`\@}
+\catcode`\@=11
+
+% 1 - To correct a bug in the note environment
+%     (reported by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - 1995)
+\@savsf=1
+
+
+% 2 - To correct several bugs to generate a list of slides with subsection
+%     entries
+%     (reported by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - Jul. 18, 1995)
+%   - To clear the subheading when a new heading is defined
+%     (reported by Axel Thimm - <thimm@physik.fu-berlin.de> - June 5, 1997)
+%   - To assure coherence between heading and subheading when used
+%     in header/footer, for article mode
+%     (reported by Axel Thimm - <thimm@physik.fu-berlin.de> - June 5, 1997)
+%   - Improvements (\refstepcounter and \@addtoreset) by Jeremy Gibbons
+%     <jgibbons@brookes.ac.uk> - Sep. 30, 1997
+
+% Used by the \slide@subheading macro but undefined
+\def\theslidesubsection{\theslidesection.\arabic{slidesubsection}}
+
+\def\slide@heading[#1]#2{%
+% D.G. modification begin - Oct. 15, 1997
+%  \stepcounter{slidesection}%
+  \refstepcounter{slidesection}%
+  \@addtoreset{slidesubsection}{slidesection}
+% D.G. modification end
+  \addtocontents{los}{\protect\l@slide
+    {\the\c@slidesection}{\ignorespaces#1}{\@SCTR}}%
+% D.G. modification begin - May 30, 1997
+%  \gdef\theslideheading{#1}%
+% D.G. modification end
+  \def\@tempa{#2}%
+  \ifx\@tempa\@empty\else
+    {\edef\@currentlabel{\csname p@slidesection\endcsname\theslidesection}%
+      \makeslideheading{#2}}%
+  \fi
+% D.G. modification begin - May 30, 1997
+  \gdef\theslideheading{#1}%
+% D.G. modification end
+% D.G. modification begin - Aug. 1, 1997
+  \gdef\theslidesubheading{}%
+% D.G. modification end
+}
+
+\def\slide@subheading[#1]#2{%
+% D.G. modification begin - Oct. 15, 1997
+%  \stepcounter{slidesection}%
+  \refstepcounter{slidesubsection}%
+% D.G. modification end
+  \addtocontents{los}{\protect\l@subslide
+    {\the\c@slidesubsection}{\ignorespaces#1}{\@SCTR}}%
+% D.G. modification begin - May 30, 1997
+%  \gdef\theslidesubheading{#1}%
+% D.G. modification end
+  \def\@tempa{#2}%
+  \ifx\@tempa\@empty\else
+    {\edef\@currentlabel{\csname p@slidesubsection\endcsname
+% D.G. modification begin - Jul. 18, 1995
+%      \theslidesubsection}\makeslideheading{#2}}%
+      \theslidesubsection}\makeslidesubheading{#2}}%
+% D.G. modification end
+  \fi
+% D.G. modification begin - May 30, 1997
+  \gdef\theslidesubheading{#1}%
+% D.G. modification end
+}
+
+
+% 3 - To correct a bug in the \slidecontents macro
+%     (reported by Denis Roegel (LORIA) <Denis.Roegel@loria.fr> - Sep. 22, 1996)
+
+\long\def\@gobblethree #1#2#3{}
+
+\def\slide@contents{%
+  \def\l@slide##1##2##3{%
+% Modification Denis Roegel begin - Sep. 22, 1996
+%    \slide@cline{\slidenumberline{$\bullet$}{##2}}{##3}}%
+%  \let\l@subslide\@gobbletwo
+% Modification Denis Roegel end
+    \slide@cline{\slidenumberline{##1}{##2}}{##3}}%
+  \let\l@subslide\@gobblethree
+  \@startlos}
+
+
+% 4 - To solve incompatibility between the `graphicx' package and Seminar.
+%     The \espfslidesize Seminar macro work only with the old version of
+%     the `epsfig' package, so with \includegraphics the PostScript files are
+%     always scaled without the possibility to leave them to there natural
+%     size. And also these files are not correctly scaled when we switch
+%     from normal to article mode under Seminar. So, we must redefined the
+%     \epsfslidesize macro of Seminar and modify few internal macros of
+%     `graphicx'.
+%     (Note: I consider only the `graphicX' package, not the 'graphicS' one)
+%     (reported by Karl Tombre  (LORIA) <Karl.Tombre@loria.fr> and
+%                  Denis Roegel (LORIA) <Denis.Roegel@loria.fr> - Jan. 16, 1997)
+
+\def\GraphicsNotScaled{%
+\ifx\Gin@viewport\undefined
+\else                           % Graphicx package detected
+\def\Gin@i{%
+ \def\Gin@req@sizes{%
+% D.G. modification begin - May 16, 1997
+   \Gin@nat@height=\inverseslidesmag\Gin@nat@height
+   \Gin@nat@width=\inverseslidesmag\Gin@nat@width
+% D.G. modification end
+   \Gin@req@height\Gin@nat@height
+   \Gin@req@width\Gin@nat@width}%
+ \@ifnextchar[\Gin@ii{\Gin@ii[]}}
+% D.G. modification begin - Feb. 19, 1997
+%\define@key{Gin}{width}{\def\Gin@ewidth{#1}}
+%\define@key{Gin}{height}{\def\Gin@eheight{#1}}
+%\define@key{Gin}{totalheight}{%
+%\def\Gin@eresize{\totalheight}\def\Gin@eheight{#1}}
+\define@key{Gin}{width}{%
+\@tempdima=##1\@tempdima=\inverseslidesmag\@tempdima\def\Gin@ewidth{\@tempdima}}
+\define@key{Gin}{height}{%
+\@tempdima=##1\@tempdima=\inverseslidesmag\@tempdima\def\Gin@eheight{\@tempdima}}
+\define@key{Gin}{totalheight}{%
+\def\Gin@eresize{\totalheight}%
+\@tempdima=##1\@tempdima=\inverseslidesmag\@tempdima\def\Gin@eheight{\@tempdima}}
+% D.G. modification end
+\fi}
+
+\def\epsfslidesize{%
+\let\epsfsize\slide@epsfsize
+% D.G. modification begin - Feb. 19, 1997
+\GraphicsNotScaled}
+% D.G. modification end
+
+
+% 5 - To solve incompatibily between the LongTable package and Seminar
+%     (reported by Bhaskar Manda (UIUC) <bhaskar@or4.me.uiuc.edu> - May 7, 1997)
+%   - Problem in article format seen later
+%     (reported by Axel Thimm <thimm@physik.fu-berlin.de> - June 5, 1997)
+
+% From seminar.cls
+\def\slide@outputLT{% (from \slide@output)
+  \@makeslide
+  \@testfalse
+  \ifnotesonly\else
+    \iflandscape
+      \ifnum\@landscapeonly>-1 \os@test\fi
+    \else
+      \ifnum\@landscapeonly<1 \os@test\fi
+    \fi
+  \fi
+  \if@test
+    \reset@slideoutput
+% D.G. modification begin - May 13, 1997
+%    \@@makeslide
+    \@@makeslideLT
+% D.G. modification end
+    \process@slide
+  \fi
+  \refstepcounter{slide}}
+\def\@@makeslideLT{% (from \@@makeslide)
+  \overfullslide@warning
+  \setbox\@slidebox\hbox{%
+    \vfuzz=\slidefuzz\relax
+    \vbox to\slide@vsize{%
+% D.G. modification begin - May 13, 1997
+    \box\@outputbox
+% D.G. modification end
+    \ifcenterslides\vskip\z@ plus .0001fil \fi
+    \unvbox\@slidebox
+    \vskip\z@ plus .0001fil}%
+    \the\after@slidepage}%
+  \wd\@slidebox\textwidth}
+
+% From LongTable
+\def\LT@output{%
+  \ifnum\outputpenalty <-\@Mi
+    \ifnum\outputpenalty > -\LT@end@pen
+      \LT@err{floats and marginpars not allowed in a longtable}\@ehc
+    \else
+      \setbox\z@\vbox{\unvbox\@cclv}%
+      \ifdim \ht\LT@lastfoot>\ht\LT@foot
+        \dimen@\pagegoal
+        \advance\dimen@-\ht\LT@lastfoot
+        \ifdim\dimen@<\ht\z@
+          \setbox\@cclv\vbox{\unvbox\z@\copy\LT@foot\vss}%
+          \@makecol
+% D.G. modification begin - May 13, 1997
+%          \@outputpage
+          \slide@outputLT
+% D.G. modification end
+          \setbox\z@\vbox{\box\LT@head}%
+        \fi
+      \fi
+      \global\@colroom\@colht
+      \global\vsize\@colht
+      \vbox
+        {\unvbox\z@\box\ifvoid\LT@lastfoot\LT@foot\else\LT@lastfoot\fi}%
+    \fi
+  \else
+    \setbox\@cclv\vbox{\unvbox\@cclv\copy\LT@foot\vss}%
+    \@makecol
+% D.G. modification begin - May 13, 1997
+%    \@outputpage
+%    \global\vsize\@colroom % Work for slides, but not for notes...
+    \slide@outputLT
+% D.G. modification end
+    \copy\LT@head
+  \fi}
+
+% We must adjust \textheight. Sometimes, you must increase it a little by
+% something like \addtolength{\textheight}{5mm}
+% But if you use slides like \begin{slide*}[15cm,10cm]
+% you must define locally \textheight=15cm
+\addtolength{\textheight}{-\headheight}
+
+
+% 6 - To allow automatic changes of language dependent labels,
+%     for instance by loading the `french' package after Seminar
+%     (suggested by Bernard Gaulle (IDRIS) <gaulle@idris.fr> - Nov. 20, 1997)
+% D.G. modification begin - Nov. 20, 1997
+% From seminar.cls
+\def\slidename{Slide}
+\def\slidelabel{\bf\slidename{} \theslide}
+% From slidesec.sty
+\def\listslidename{List of Slides}%
+\def\listofslides{\section*{\listslidename%
+\@mkboth{\expandafter\MakeUppercase\listslidename}%
+        {\expandafter\MakeUppercase\listslidename}}%
+  \def\l@slide##1##2##3{%
+    \slide@undottedcline{\slidenumberline{##3}{##2}}{}}%
+  \let\l@subslide\l@slide
+  \@startlos}
+% D.G. modification end
+
+
+% 7 - There were several problems when doing a global change of color
+%     outside the "slide"environment (using the \color{ColorName} macro
+%     of the `color' package) if this change was not done globally
+%     (that is to say before the "\begin{document}") but inside the document,
+%     for a part of the slides.
+%     These problems can be seen specially for screen presentations,
+%     when we want to use a dark background, so a light foreground color
+%     for the text.
+%     First, the header (defining for instance with the `fancyhdr' package)
+%     changed of color one slide later and was restored one slide later too
+%     if the change of the color was mas inside a group for some slides,
+%     and second, the black color was forced by the footer.
+%     We solve the first problem by usage of the same technique than the one
+%     used by Seminar for global changes based on \special macros and made
+%     before the "\begin{document}". We save the \specials in the
+%     \saved@specials box and insert it at the beginning of the \@slidebox box
+%     with the \insert@specials macro, as for the first slide.
+%     And we solve the second problem by suppression of the command in the
+%     hook which force the black color (defined in the `semcolor' package).
+%     (reported by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - 1999-2002)
+
+% Built from \save@srlidespecials (for all slides excepted the first one)
+\def\save@slidespecials@ii{%
+  \begingroup
+    \output{%
+      \global\setbox\saved@specials=\box\@cclv
+      \global\wd\saved@specials=\z@
+      \global\dp\saved@specials=\z@
+      \global\ht\saved@specials=\z@}%
+    \hbox{}\penalty-\@M
+  \endgroup}%
+
+% The first slide is already managed, so we will define \save@slidespecials@i
+% started to the second one only...
+\def\save@slidespecials@i{}%
+
+\ifarticle\else
+  \def\insert@specials{%
+    \ifvoid\saved@specials\else
+      \setbox\@slidebox\hbox{\box\saved@specials\box\@slidebox}%
+    \fi
+% D.G. modification begin - Mar. 28, 2002
+%    \global\let\insert@specials\relax}
+    \global\let\save@slidespecials@i\save@slidespecials@ii}
+% D.G. modification end
+\fi
+
+\addto@hook{\before@newslide}{\save@slidespecials@i}
+
+% D.G. modification begin - 1999
+% \addto@hook\after@slidepage{\pstVerb{0 setgray}}
+\after@slidepage={}
+% D.G. modification end
+
+
+% 7 - To vertically correctly center the footer, if defined
+%     (this is mainly visible when using the `fancyhdr' package, and specially
+%     when a footer rule line is defined)
+%     (reported by Denis Girou (CNRS/IDRIS) - <Denis.Girou@idris.fr> - April 1998)
+
+% 8 - Add-on to allow "full screen" backgrounds.
+%     Seminar originally support only partial backgrounds, which doesn't cover
+%     the full page but only the place of the text. It cannot be easily
+%     modified, as there are dependancies between the header and the text.
+%     So, we choose to define new macros \SeminarNewSlideFrameBackground
+%     and \SeminarSlideFrameBackground to manage the full screen backgrounds,
+%     designed on the model of the \newslideframe and \slideframe ones.
+%     (added by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - Jun. 30, 1999)
+
+% D.G. modification begin - Jun. 30, 1999
+\newbox\Seminar@SlideBoxBackground
+% D.G. modification end
+
+\ifarticle
+\else
+  \def\output@slide{%
+    \begingroup
+      \hoffset=-\inverseslidesmag in
+      \voffset=-\inverseslidesmag in
+      \setslidelength\@tempdima{%
+        \ifportrait\paperwidth\else\paperheight\fi}%
+      \setslidelength\@tempdimb{%
+        \ifportrait\paperheight\else\paperwidth\fi}%
+      \ifrotateheaders
+        \@ifrotateslide{%
+          \dimen@=\@tempdima
+          \@tempdima=\@tempdimb
+          \@tempdimb=\dimen@}
+      \fi
+      % \oddsidemargin, \evensidemargin, \headheight, \footheight
+      % used for scratch:
+      % Some page styles like to know \textwidth:
+      \setslidelength\headheight\slidetopmargin
+      \setslidelength\footheight\slidebottommargin
+      \ifautoslidemargins
+        \textwidth=\wd\@slidebox
+        \oddsidemargin=\@tempdima
+        \advance\oddsidemargin-\textwidth
+        \divide\oddsidemargin 2
+      \else
+        \setslidelength\oddsidemargin\slideleftmargin
+        \setslidelength\evensidemargin\sliderightmargin
+        \textwidth=\@tempdima
+        \advance\textwidth-\oddsidemargin
+        \advance\textwidth-\evensidemargin
+      \fi
+      \setbox\@slidebox=\hbox to \@tempdima{%
+% D.G. modification begin - Jun. 30, 1999
+        \box\Seminar@SlideBoxBackground
+% D.G. modification end
+        \kern\oddsidemargin
+        \vbox to\@tempdimb{%
+          \ifnum\fancyput@flag>-1
+            \hbox{\kern-\oddsidemargin\do@fancyput}%
+          \fi
+          \let\label\@gobble
+          \let\index\@gobble
+          \let\glossary\@gobble
+          \vbox to\headheight{%
+            \vfill
+            \hbox{%
+              \slideheadfont\relax\strut
+              \hbox to\textwidth{\@oddhead}}%
+            \kern\z@}%
+          \vfill
+          \hbox to\textwidth{\hss\box\@slidebox\hss}%
+          \vfill
+          \vbox to\footheight{%
+% D.G. modification begin - May 15, 1998
+            \vfill
+% D.G. modification end
+            \hbox{%
+              \slidefootfont\relax\strut
+              \hbox to\textwidth{\@oddfoot}}%
+            \vfill}}%
+        \hss}%
+      \ifrotateheaders\@ifrotateslide\rotate@slide\fi
+      \insert@specials
+% D.G. modification begin - Jun. 24, 1999
+      \let\protect\noexpand
+% D.G. modification end
+      \shipout\box\@slidebox
+    \endgroup
+    \let\firstmark\botmark}
+  \@ifundefined{fancyput@flag}{\def\fancyput@flag{-1}}{}
+\fi
+
+\def\finish@slide{%
+% D.G. modification begin - Jun. 30, 1999
+  \theSlideFrameBackground
+% D.G. modification end
+  \theslideframe
+  \add@slidelabel\slidelabel}
+
+% D.G. modification begin - Jun. 30, 1999
+% Built according \newslideframe, \slideframe, etc.
+
+\def\SeminarNewSlideFrameBackground#1{%
+  \@ifnextchar[{\@SeminarNewSlideFrameBackground{#1}}%
+               {\@SeminarNewSlideFrameBackground{#1}[]}}
+\def\@SeminarNewSlideFrameBackground#1[#2]{%
+  \@namedef{semsfbops@#1}{#2}%
+  \@namedef{semsfb@#1}##1}
+
+\def\SeminarSlideFrameBackground{\Seminar@SlideFrameBackground{Slide}}
+\def\Seminar@SlideFrameBackground#1{%
+  \@ifstar{\@testtrue\Seminar@@SlideFrameBackground{#1}}%
+          {\@testfalse\Seminar@@SlideFrameBackground{#1}}}
+\def\Seminar@@SlideFrameBackground#1{%
+  \@ifnextchar[{\Seminar@@@SlideFrameBackground{#1}}%
+               {\Seminar@@@SlideFrameBackground{#1}[]}}
+\def\Seminar@@@SlideFrameBackground#1[#2]#3{%
+  \def\@tempa{none}%
+  \def\@tempb{#3}%
+  \ifx\@tempa\@tempb
+    \@namedef{the#1FrameBackground}{\relax}%
+  \else
+    \ifx\@tempb\@empty
+      \@namedef{the#1FrameBackground}{}%
+    \else
+      \@ifundefined{semsfb@#3}%
+        {\@seminarerr{Background slide frame `#3' undefined}\@eha}%
+        {\if@test
+          \Seminar@@@@SlideFrameBackground{#1}[#2]{#3}%
+        \else
+          \@namedef{the#1FrameBackground}{%
+            \setbox\Seminar@SlideBoxBackground=\hbox{{%
+              \@nameuse{semsfbops@#3}#2%
+                \@nameuse{semsfb@#3}{\box\Seminar@SlideBoxBackground}}}}%
+        \fi}%
+     \fi
+   \fi}
+\def\Seminar@@@@SlideFrameBackground#1[#2]#3{%
+  \expandafter\let\expandafter\@tempa\csname the#1FrameBackground\endcsname
+  \edef\next{%
+    \noexpand\def\expandafter\noexpand\csname the#1FrameBackground\endcsname}%
+  \expandafter\next\expandafter{\@tempa
+    \setbox\Seminar@SlideBoxBackground=\hbox{{%
+      \@nameuse{semsfbops@#3}%
+      #2%
+      \@nameuse{semsfb@#3}{\box\Seminar@SlideBoxBackground}}}}}%
+
+\SeminarSlideFrameBackground{none}
+
+
+% 9 - For screen presentations, and specially animated graphics,
+%     we need more than 10 overlays. We increase the limit to 676 (26^2).
+%     (added by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - Dec.  5, 2001)
+
+\def\overlay#1{%
+% D.G. modification end
+  \ifoverlays\ifx\@overlay\relax\nooverlays@err\fi\fi
+  \ifslide
+    \@tempcnta=#1
+    \@testfalse
+% D.G. modification begin - Dec.  5, 2001
+%     \ifnum\@tempcnta>-1 \ifnum\@tempcnta<10 \@testtrue\fi\fi
+    \ifnum\@tempcnta>-2 \ifnum\@tempcnta<677 \@testtrue\fi\fi
+% D.G. modification end
+    \if@test
+      \c@overlay=\@tempcnta
+      \ifnum\c@overlay=0
+        \advance\c@slide by -1
+        \refstepcounter{slide}%
+      \else
+        \advance\c@overlay by -1
+        \refstepcounter{overlay}%
+        \ifoverlays
+          \xdef\overlay@list{\overlay@list,\the\c@overlay}%
+        \fi
+      \fi
+      \ifoverlays
+        \@overlay{\the\c@overlay}%
+      \fi
+    \else
+% D.G. modification begin - Dec.  5, 2001
+%       \@seminarerr{\string\overlay\space argument must be
+%         an integer between 0 and 9}\@eha
+      \@seminarerr{\string\overlay\space argument must be
+        an integer between 0 and 676}\@eha
+% D.G. modification end
+    \fi
+  \else
+    \@seminarerr{\string\overlay\space can only be used
+      in slide environments}\@eha
+  \fi
+  \ignorespaces}
+
+\def\overlay@loop{%
+  \begingroup
+    \overlay@prep
+    \c@overlay=1
+% D.G. modification begin - Dec.  5, 2001
+%     \@whilenum\c@overlay<10
+    \@whilenum\c@overlay<677
+% D.G. modification end
+      \do{%
+        \test@member{\the\c@overlay}{\overlay@list}%
+        \if@test
+          \make@overlay{\the\c@overlay}%
+          \finish@slide
+          \output@slide
+        \fi
+        \layer@loop{\the\c@overlay}%
+        \advance\c@overlay by 1}%
+  \endgroup}
+
+% D.G. modification begin - Dec.  5, 2001
+% \def\theoverlay{\theslide-\alph{overlay}}
+\def\theoverlay{{%
+\ifnum\c@overlay>26
+  \@tempcnta=\c@overlay
+  \advance\@tempcnta\m@ne
+  \divide\@tempcnta by 26
+  \multiply\@tempcnta by 26
+  \@tempcntb=\c@overlay
+  \advance\@tempcntb-\@tempcnta
+  \@tempcnta=\c@overlay
+  \advance\@tempcnta\m@ne
+  \divide\@tempcnta by 26
+  \theslide-\@alph{\@tempcnta}\@alph{\@tempcntb}%
+\else
+  \theslide-\alph{overlay}%
+\fi}}
+% D.G. modification end
+
+
+% 10 - Addition for management of cumulative and progressive overlays.
+%      Due to PSTricks, Seminar had since the beginning the required
+%      capabilities to manage overlays in various ways. The only thing
+%      to do is to redefine the PSTricks \pst@initoverlay macro in the
+%      relevant way.
+%      (added by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - 1999-2001)
+
+% From `semcolor'
+\def\make@overlay#1{%
+  \setbox\@slidebox=\hbox{%
+    \pst@initoverlay{#1}%
+% D.G. modification begin - Dec.  5, 2001
+%     \pst@Verb{(0) BOL}%
+    \pst@Verb{0 BOL}%
+% D.G. modification end
+    \copy\@@slidebox
+% D.G. modification begin - Dec.  5, 2001
+%     \pst@Verb{(all) BOL}}}
+    \pst@Verb{-1 BOL}}}
+% D.G. modification end
+
+% D.G. modification begin - Feb. 15, 2002
+% We must redefine too the /BeginOL macro form pstricks.pro, as "all" is now -1
+% \def\pst@initoverlay#1{\pst@Verb{\tx@InitOL /TheOL (#1) def}}
+\def\pst@initoverlay#1{%
+\pst@Verb{%
+/BeginOL {%
+  dup -1 eq exch TheOL eq or
+    {IfVisible not
+      {Visible /IfVisible true def}
+     if}
+    {IfVisible
+      {Invisible /IfVisible false def}
+     if}
+  ifelse} def
+\tx@InitOL
+/TheOL #1 def}}
+% D.G. modification end
+
+\def\pst@overlay#1{%
+\edef\curr@overlay{#1}%
+% D.G. modification begin - Dec.  5, 2001
+% \pst@Verb{(#1) BOL}%
+\pst@Verb{#1 BOL}%
+% D.G. modification end
+\aftergroup\pst@endoverlay}
+\def\pst@endoverlay{%
+% D.G. modification begin - Dec.  5, 2001
+% \pst@Verb{(\curr@overlay) BOL}}
+\pst@Verb{\curr@overlay\space BOL}}
+% D.G. modification end
+
+% Cumulative overlays
+% °°°°°°°°°°°°°°°°°°°
+
+% Cumulative overlays, to force to print all preceding ones
+\def\SeminarCumulativeOverlays{%
+\def\pst@initoverlay##1{%
+\pst@Verb{%
+/BeginOL {%
+  dup -1 eq exch TheOL le or
+    {IfVisible not
+      {Visible /IfVisible true def}
+     if}
+    {IfVisible
+      {Invisible /IfVisible false def}
+     if}
+  ifelse} def
+\tx@InitOL
+/TheOL ##1 def}}}
+
+% Alternative method for same goal (needed when PSTricks nodes are used)
+\def\SeminarAltCumulativeOverlays{%
+\def\pst@initoverlay##1{%
+\pst@Verb{%
+/BeginOL {%
+  dup -1 eq exch TheOL le or
+    {IfVisible not
+      {Visible /IfVisible true def}
+     if}
+    {IfVisible
+      {Invisible /IfVisible false def}
+     if}
+  ifelse} def
+\tx@InitOL
+/Visible {initclip} def
+/Invisible {CP newpath OLUnit itransform moveto clip newpath moveto} def
+/TheOL ##1 def}}}
+
+% Progressive overlays
+% °°°°°°°°°°°°°°°°°°°°
+
+% Progressive overlays (at step i, only overlays 0 and i are shown)
+\def\SeminarProgressiveOverlays{%
+\def\pst@initoverlay##1{%
+\pst@Verb{%
+/BeginOL {%
+  /NumOL ED
+  NumOL -1 eq NumOL 0 eq NumOL TheOL eq or or
+    {IfVisible not
+      {Visible /IfVisible true def}
+     if}
+    {IfVisible
+      {Invisible /IfVisible false def}
+     if}
+  ifelse} def
+\tx@InitOL
+/TheOL ##1 def}}}
+
+% Alternative method for the same goal (needed when PSTricks nodes are used)
+\def\SeminarAltProgressiveOverlays{%
+\def\pst@initoverlay##1{%
+\pst@Verb{%
+/BeginOL {%
+  /NumOL ED
+  NumOL -1 eq NumOL 0 eq NumOL TheOL eq or or
+    {IfVisible not
+      {Visible /IfVisible true def}
+     if}
+    {IfVisible
+      {Invisible /IfVisible false def}
+     if}
+  ifelse} def
+\tx@InitOL
+/Visible {initclip} def
+/Invisible {CP newpath OLUnit itransform moveto clip newpath moveto} def
+/TheOL ##1 def}}}
+
+% Generation of the next overlay (minor add-on)
+% °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°
+% (it increment automatically the number of the current overlay)
+\newcommand{\SeminarNextOverlay}[1]{%
+\addtocounter{overlay}{1}%
+\begin{overlay}{\the\c@overlay}#1\end{overlay}}
+
+% To force all items in the various list environments to appear
+% in their own overlay (minor add-on)
+% °°°°°°°°°°°°°°°°°°°°
+\let\itemORIG\item
+
+\def\SeminarItemInOverlay{%
+\def\item{%
+\addtocounter{overlay}{1}%
+\overlay{\the\c@overlay}%
+\itemORIG}}
+
+\catcode`\@=\TheAtCode\relax
+\endinput
+%% END seminar.bg2