A ceramic package with a lid attached thereon, which has radiating grooves at its upper surface andor lower surface to radiate heat generated from a chip-type device is disclosed. The printhead is preheated to a desired temperature during a maintenance mode. Once the sub network has been determined, as well as the subnet mask, the process determines the other sub networks which may co-exist within the Intranet. In another aspect, the invention provides a nonmigrating, gelled filling suitable for use in the sandwich with the extended shelf life.