Benjamin Bayart is known in the French TeX-users community as being the author of the Joli Manuel Pour LaTeX.
In the JMPL, as it is today, 162 package are directly used, loaded in the same document by LaTeX, with \usepackage. To read so many package do lead to a lot of conflicts : macro redifinitions, active characters, and so on.
He will present us some of the tricks used to make it possible to load packages and use them in a single document, even when there are major conflicts. For that purpose he wrote various packages like contextsw or hotplug.