An ergonomic mouse accessory that allows the user to easily manipulate the control buttons of the mouse with a variety of hand positions and varying movements, thereby reducing or eliminating repetitive strain injuries and increasing accessibility to those unable to operate a standard mouse. A separate set of shadow memory address mappings is maintained for each execution environment. The request, including the derived roaming status information, is sent from the gateway node to a session control means. The optical path converting member includes a lens and an optical path conversion mirror having an entrance surface, an exit surface and a reflection surface, and the lens is provided at least one position selected from the entrance surface, the exit surface, and inside of the optical path conversion mirror. An endotracheal tube has a conductive strip.