/*! @page  gui LEmuSR Tree
 
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@section sgui Geant4 user interface manager
Geant4 interactivity is possible thanks to the user interface manager G4UIManager. It is a powerfull tool that allows the user to change any parameter of the simulation entering commands in a terminal. In addition to the commands included in \gf, one can implement ones own commands by the use of messenger classes. An example of building a messenger class for the detector geometry can be found in @ref messengers .

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