A group video messaging method stores user information identifying authorized users of a video messaging system, and provides a user interface to the video messaging system. The internal voltage generator receives an external voltage and generates an internal voltage based on the external voltage. Two or four pairs of short high-inertia rollers are revolvably supported adjacent to the platform, and positioned to individually support either the front wheels or the back wheels of the vehicle. The connecting server embeds a grouping identifier into a network packet, and transmits the network packet to the controlling server via the switch.