A tubular actuating system includes, a tubular, a plurality of same plugs runnable within the tubular, and an alterable actuator disposed at the tubular. The actuator is alterable in response to passage of a first of the plurality of same plugs run into contact therewith. A second of the plurality of same plugs is seatingly engagable with the alterable actuator run thereagainst when in an altered condition such that pressure built up against the second of the plurality of same plugs causes actuational movement of the alterable actuator. A flapper seat is movably disposed at the alterable actuator between at least a first position defined by the alterable actuator in an unaltered position and a second position defined by the alterable actuator in an altered position.