The Geant4 user interface manager

Geant4 provides a total interactivity tool as the user interface manager G4UIManager. It is a powerfull device that allow the user to change any parameter of the simulation entering command via a terminal. In addition to the modification possibilities included in Geant4 , one can implement its own commands in the user classes. This is explained at the end of this section. An example of building a messenger for the detector geometry can be found in .