PrimaryGeneratorAction class. 
 
void BeginOfRunAction(const G4Run *)
 
virtual G4Run * GenerateRun()
 
DetectorConstruction * fDetector
 
HistoManager * fHistoManager
 
void EndOfRunAction(const G4Run *)
 
Detector construction class to define materials and geometry. 
 
PrimaryGeneratorAction * fPrimary