GeoNet is divided into three sub folders
“base”
This folder holds the core MATLAB files of GeoNet:
“exec”
This folder contains the user templates. The templates are used to run GeoNet without modifying the core MATLAB files:
“mex”
This folder contains the MATLAB executables (MEX). MEX files are dynamically linked subroutines produced from C, C++, or Fortran source code that when compiled can be run from within MATLAB in the same way as MATLAB built in functions. (http://www.mathworks.com/support/tech-notes/1600/1605.html#intro).