The disclosed invention is directed to a watercraft which comprises at least one main force member attached to at least one wing; the main force member andor wing andor a float attached to the wing comprise sufficient displacement to provide flotation for the craft and its payload. A \u201cpublish and subscribe\u201d model is used in which vendors may publish catalogs and information about product and service offerings to AgoraNet applications hosted at a national site. The point of application of the pressing spring 33 is located in a triangle formed by internal tangents of the three movable contacts.