A computer workstation runs an application 10 to participate in a video conference. A left front thin side plate constituting the left side plate, a right front thin side plate constituting the right side plate, a front thin upper plate constituting the upper plate, and a front thin lower plate constituting the lower plate are formed by using a high tensile steel material having a small plate thickness. Thus, having a processor dedicated to performing actions that have been pre-scheduled can be expensive. After forming the gate-defining members, remaining insulative member portions are removed from above the semiconductor body of the tri-gate device but not the I-gate device.