In certain embodiments, an Internet Protocol Television network comprises an operating multicast tree comprising a first set of nodes and components. A plate image inspection processor executes a plate image inspection process by comparing the first and second raster image data, and displays on a display device the result of the plate image inspection process. Additionally, it is determined whether a type of the operation attempted includes a predefined type of operation. Diagnostic, screening, and therapeutic methods utilizing compositions of the invention are also provided. The glass item especially comprises an antimicrobial agent beneath the surface of the glass, and an inorganic component in the mass of the glass close to said surface, the concentration of the inorganic component being distributed according to a diffusion profile. The computer requests and receives the trusted current date and time value and compares the trusted current date and time value to a validity period included in the digital certificate, to determine if the digital certificate is expired.