An apparatus is provided comprising a first device for holding one or more arrows and a second device fixed to the first device for attaching the first device and the one or more arrows to an archery bow. The client-side code is executed on the client side to become a widget with dynamic behavior attributes displayed as a component of a web page on a display screen of a client-side computing device. The look up table includes a charging station look up table and a discharging station look up table. In this manner, the amount of composite power per channel is increased. An end determinator outputs the current positionposture estimation value as an optimum positionposture estimation value when determining that the positionposture difference value is smaller than a predetermined threshold value. On the transparent board, one or more layers of light shielding films are formed with or without other film in between, at least one layer which constitutes the light shielding film includes silicon and a transition metal as main component, and a molar ratio of silicon to the transition metal is silicon:metal=4-15:1.