How to do slides in latex by jme (aka el latexator)

Abstract:
  This text describes how to edit slides in latex. It is just my
  personnal experience.

Q. What is the document class to use in latex ?
A. if the user wants 'normal' slides, \documentclass{slides}
   if the user wants landscape ones, \documentclass[landscape]{slides}

Q. What is the environment to define each slides
A. \begin{slide} .... \end{slide}

Q. How to convert/print landscape slides in postscript
A. The user must notify dvips it is landscape
   ex: dvips -t landscape myslides.dvi

Q. How to display landscape on the screen ?
A. The user must notify xdvi it is landscape. As xdvi has no notion of 
   landscape so the user must specify a 'rotated' paper format e.g a4r
   for a4.
   ex: xdvi -paper a4r myslides.dvi

Q. what about a concret example ?
A. \documentclass[landscape]{slides}
   % no page number
   \pagestyle{empty}
   \begin{document}

   \begin{slide}
   first slide is beautifull...
   \end{slide}

   \begin{slide}
   the second one is even better...
   \end{slide}

\end{document}