Editing Program Structure (section)

===How to specify the type of Physics process===
The user must create a class derived from ''G4VUserPhysicsList'' and implement the pure virtual method ''ConstructProcess()''.
For a Physics process you must register the ''G4Transportation'' class with all particle classes. The AddTransportation() method is listed and provided in G4VUserPhysicsList class.
 void MyPhysicsList::ConstructProcess()
  {
    // Define transportation process
    AddTransportation();
  }