The present invention is directed to a retainer assembly for anchoring environmental containment and remediation materials in a desired location. In a first phase, a first set of therapy parameter values are modified while the posture responsive therapy mode is deactivated. The beam has a mean direction of radiation. First and second valves are received in the valve receiving bores. A second set of characteristics of the user interface different form the first set of characteristics are controlled in accordance with the control program.