End-to-end authentication capability based on public-key certificates is combined with the Session Initiation Protocol to allow a SIP node that receives a SIP request message to authenticate the sender of request. The supporting structure is in the shape of pluralities of slope structured solar cell plate mount accompanied by cleaning accesses mounted on a rectangular cube frame. The body defines an opening adapted to receive a torso of a swimmer. When the current is greater than a predetermined value, the computer terminal is decoupled from the power supply. Stolen or otherwise compromised shadow account numbers are useless with other non-associated merchants.