A wagering game system includes a service for conducting a group-wagering game for a group of players under the control of a gaming control system and a plurality of gaming terminals, each gaming terminal connected to the service and being configured to conduct a group-wagering game in combination with the service. One of the second and third circuits includes at least one field effect transistor. The composite silicon oxide layer comprises two silicon oxide layers, each having a different siliconoxide composition. A pressure release opening in the seal cover is in fluid communication with the circumferential passage.