Seeds having applied to their surface a bioactive agrichemical composition comprising metal-acid solutions for protecting the seed from the adverse action of microorganisms. A high definition video camera sends a video image in real time. The sender of a data-bearing frame does not need to wait for a frame to be acknowledged before sending the next, such that many frames can be \u201cin flight\u201d at once. The valve-testing system may also include a sensor configured to provide a signal relating to pressure in the first plumbing. Having recognized an off-hook state of telephone in accordance with the off-hook information, the request unit automatically initiates the directory application software.