Hi,

There is a brief summary of Catel's job in the following blog post about the module catalog composition extension for Prism:

• Catel extends Prism modularity options through NuGet
  

In addition, you may find the CompositeModuleCatalog.cs implementation of ___Catel'___s extension in the following site:

• Catel.Extensions.Prism/Modules/CompositeModuleCatalog.cs
  

Regards.
Gabriel Ostrowsky
https://blogs.southworks.net/gostrowsky