A system for fracturing a zone of a hydrocarbon bearing formation, comprising: a valve (100a,b), comprising: a tubular housing for assembly as part of a string of tubulars and having a bore therethrough and one or more flow ports formed through a wall thereof; one or more locator tags embedded in the housing; and a sleeve (204, 204a) disposed in the housing and longitudinally movable relative thereto between an open position and a closed position, wherein the sleeve (204, 204a) seals the ports from the bore in the closed position and exposes the ports to the bore in the open position; and a shifting tool for deployment through the tubular string, comprising: a sleeve shifter movable between an extended position and a retracted position and operable to engage the valve sleeve (204, 204a) in the extended position and pass through the valve sleeve (204, 204a) in the retracted position, the sleeve shifter being a collet having split fingers, each finger having a respective enlarged portion with ramped surfaces (224, 232, 242) at ends thereof; a lock axially movable between a locked position and an unlocked position, the lock located radially inward of the enlarged portions in the locked position, the lock keeping the sleeve shifter extended in the locked position and allowing the sleeve shifter to retract in the unlocked position; an actuator connected to the lock and operable to at least move the lock axially from the unlocked position to the locked position; an antenna for detecting the locator tags; an electronics package in communication with the antenna and the actuator for operating the actuator in response to detection of the locator tags; and a work line rope socket connected to the electronics package and the antenna. a valve (100a,b), comprising: a tubular housing for assembly as part of a string of tubulars and having a bore therethrough and one or more flow ports formed through a wall thereof; one or more locator tags embedded in the housing; and a tubular housing for assembly as part of a string of tubulars and having a bore therethrough and one or more flow ports formed through a wall thereof; one or more locator tags embedded in the housing; and a sleeve (204, 204a) disposed in the housing and longitudinally movable relative thereto between an open position and a closed position, wherein the sleeve (204, 204a) seals the ports from the bore in the closed position and exposes the ports to the bore in the open position; and a shifting tool for deployment through the tubular string, comprising: a sleeve shifter movable between an extended position and a retracted position and operable to engage the valve sleeve (204, 204a) in the extended position and pass through the valve sleeve (204, 204a) in the retracted position, the sleeve shifter being a collet having split fingers, each finger having a respective enlarged portion with ramped surfaces (224, 232, 242) at ends thereof; a lock axially movable between a locked position and an unlocked position, the lock located radially inward of the enlarged portions in the locked position, the lock keeping the sleeve shifter extended in the locked position and allowing the sleeve shifter to retract in the unlocked position; an actuator connected to the lock and operable to at least move the lock axially from the unlocked position to the locked position; an antenna for detecting the locator tags; an electronics package in communication with the antenna and the actuator for operating the actuator in response to detection of the locator tags; and a work line rope socket connected to the electronics package and the antenna. a sleeve shifter movable between an extended position and a retracted position and operable to engage the valve sleeve (204, 204a) in the extended position and pass through the valve sleeve (204, 204a) in the retracted position, the sleeve shifter being a collet having split fingers, each finger having a respective enlarged portion with ramped surfaces (224, 232, 242) at ends thereof; a lock axially movable between a locked position and an unlocked position, the lock located radially inward of the enlarged portions in the locked position, the lock keeping the sleeve shifter extended in the locked position and allowing the sleeve shifter to retract in the unlocked position; an actuator connected to the lock and operable to at least move the lock axially from the unlocked position to the locked position; an antenna for detecting the locator tags; an electronics package in communication with the antenna and the actuator for operating the actuator in response to detection of the locator tags; and a work line rope socket connected to the electronics package and the antenna.