In telecommunication, command and control (C 2 ) is the exercise of authority and direction by a properly designated commander over assigned and attached forces in the accomplishment of the mission. Command and control functions are performed through an arrangement of personnel, equipment, communications, facilities, and procedures employed by a commander in planning, directing, coordinating, and controlling forces and operations in the accomplishment of the mission.
... name was Hemerken or Hammerlein, "little hammer."
In 1395 he was sent to the school at Deventer
conducted by the Brethren of the Common Life[?].
He became ...