All of Eicra's applications are divided into modules. A module is a group of high level features (ex : managing users profile) that in fact needs several controllers, models, and views.
so each module encapsulate his own folder tree composed by the same folders than the application folder except for the folder module (a module doesn't have child module).
and most module folder also encapsulates a data folder, a forms folder and a models folder
Module's Path : /<$ServerPath>/application/modules/<$ModuleName>
NB : $ServerPath represents your home Dir when the application is installed.