A pipe joint, and a method of forming a pipe joint between two metallic pipes which have been internally andor externally coated with a material to prevent corrosion includes a spigot and a socket. A phase-shifting portion which transmits the exposing light in an opposite phase with respect to the first opening is formed on the transparent substrate around the first opening. Responsive to the creation of the communications link between the application execution server agent and the client agent, the application executes on the application execution server and the user is capable of interactively using the application running on the application execution node from the client node. Connected regions of motion vectors at least equal to the threshold are identified and measured for size.