Abstract: A hydrocarbon control system includes a base device, a field device, and a mobile device. The base device includes a key generator configured to generate a temporary key. The field device is configured to restrict or allow access based on verification of a received key. The mobile device is configured to communicate with the base device to receive the temporary key when in proximity of the base device, communicate with the field device to provide the temporary key to the field device when in proximity of the field device, and exchange data with the field device in response to the field device verifying the temporary key.

Abstract: A system and method for treating damaged musculoskeletal tissue includes an orthopedic support structure and a nitroglycerin-containing composition. The orthopedic support structure provides mechanical support to the damaged tissue and maintains the nitroglycerin-containing composition in contact with the skin of a subject wearing using the system. The nitroglycerin-containing composition can be integrated into the orthopedic support structure or the support structure can be configured to contain removable doses of the nitroglycerin-containing composition. The system and method provides relief of pain and improved function of the musculoskeletal tissue.