A command and control bar for a kite sail associated with two front cables connected to a user and two rear cables connected to the bar. The cables are connected at one end to the sail. An adjustment element to shorten/extend the rear cables is incorporated into the bar and can be controlled by the user without releasing the bar. A deflection system can be displaced parallel to the axis of the bar and is connected to a return element. The bar includes a locking element to lock/release the position of the deflection system along the bar, depending on the traction forces applied on the cables. The locking element is accessible to the user from outside the bar.