First steps :
  -----------
  Click in 'snovis/Detector' to visualize some default geometry.
 
  Click in 'snovis/Run...' to map the Run dialog box.
  
  Click in Apply to start a run.

  After each event, control is given to the GUI.
 Someone can play with the Inventor viewer controls
 to manipulate the scene.

  Click in 'snovis/Next evt' to produce a new event.

  By default, the command prompt is set to Geant4 commands.

  Geometry viewing :
  ----------------
  Click in 'Tree/PhysicalVolumes' to display the geometry
 hierachy in the tree widget (the one at the
 left of the viewer).

  Choose an item in the tree to visualize it.