====== Beamer ======

Commands:
  * ''\uncover<n-m>{}'': uncover content only for slides n-m (syntax "n-" or "-m" allowed)
  * ''\only<n-m>{}'': same as ''\uncover'', except it doesn't reserve space for slides other than n-m
  * ''\alt<n-m>{}{}'': uncover first argument for slides n-m, and second argument else

Environments:
  * ''textblock'' in order to put content at any given place: <code latex>

\usepackage[absolute,showboxes,overlay]{textpos}
%\TPshowboxestrue % for development, comment when done
\TPshowboxesfalse % uncomment to hide boxes
\textblockorigin{10mm}{20mm} % positions origin
</code><code>
\begin{textblock*}{110mm}[0,0](0mm,20mm)
\end{textblock*}
</code>

  * http://lesfichesabebert.fr/index.php/Beamer/Overlay#alert