An RF directional detection system created for alerting hunters of nearby friendlies who are located in critical areas defined by the ability to communicate their directional position to the hunters for safety purposes. The fastener device is connected with the chair device and has a main body, a button and a button elastic member. An infrared camera photographs an infrared image reflected from the curved screen. Process configuration information stored in a process configuration storage unit indicates process configuration elements of a process performed in the information processing system and a connection relationship between the process configuration elements. The casing section of the present invention includes a sleeve which can be moved between a first position in which access to the window opening of casing section is not affected and a second position in which the main casing is sealed from the liner section of a deviated wellbore to provide a hydraulic seal against passage of fluids from outside the casing of the wellbore into the main casing.