Patent ID: 8172833

Claim:
A system, comprising: a recordable signal bearing medium bearing: instructions for generating an electromagnetic control signal with a remote controller, the electromagnetic control signal including frequency components absorbable by an electromagnetically responsive control element of a delivery device in an environment, the delivery device including a fluid-containing structure containing a delivery fluid and a quantity of primary material, the primary material being distributed between a first active form and a second form and having an effective concentration in the delivery fluid equal to the concentration of the first active form in the delivery fluid, wherein the effective concentration of the primary material in the delivery fluid is controllable by the electromagnetically responsive control element; and instructions for controlling the transmission of the electromagnetic control signal to the delivery device with a remote controller, the electromagnetic control signal having signal characteristics sufficient to activate the electromagnetically responsive control element in the delivery device to control the effective concentration of the primary material in the delivery fluid in the delivery device.