An apparatus and method for treatment of a tubular anatomical structure is disclosed. Keywords include session synchronization and transfer credentials. The first MOS transistor includes a first source and drain regions spaced from each other, a first gate insulating film provided on the surface, a first gate electrode provided on the first gate insulating film, and a first channel region located immediately below the first gate insulating film and containing impurities of both conductivity types. The port to which the device is connected is dynamically configured based on the port configuration policy.