A method and an apparatus for providing bidirectional communication between a user agent and an Internet Web server. A charge pump circuit includes a clamp circuit, and based on the control signal, provides a control voltage of which lower limit is the reference voltage level. The storage container is characterized by the following features: a gutter surrounding the tank that is directly contiguous with the outer wall of the storage container and that collects leaked liquid, at least one gutter outlet, at least one liquid collection container, and at least one detection system for the water-endangering liquids. The air chamber is interconnected with the connecting chamber by through holes. Methods of inducing an immune response in an individual against an immunogen, using such compositions are disclosed.