Geant4 User's Guide For Application Developers Communication and Control
7.1 Built-in Commands
Geant4 has various built-in user interface commands, each of which
corresponds roughly to a Geant4 category. These commands can be used
interactively via a (Graphical) User Interface - (G)UI,
in a macro file via /control/execute <command>,
within C++ code with the ApplyCommand method of G4UImanager.
Note The availability of individual commands, the ranges of parameters,
the available candidates on individual command parameters vary
according to the implementation of your application and may even
vary dynamically during the execution of your job.