Enter IDDT two times in Map mode to see ALL objects in the form of little triangles. The cheat system assumes that the keyboard is QWERTY, which can change them on international keyboards. cvar_restart deletes all custom cvars and reset all et-based on its default.
Like the previous games in the Quake series, Quake III contains lots of 'console' commands that can perform useful functions not described in the manual.
it will help you have an overview and solid multi-faceted knowledge. Press ~ (tilde key) during game play to access the console then enter the following codes and press enter to activate them.