An interactive information dissemination and retrieval system is disclosed herein. In order to cause a phase difference, the diffraction aberration corrector that induces a vector potential, which is perpendicular to the beam axis and has a symmetrical distribution within the orthogonal plane with respect to the beam axis, is provided near the objective aperture and the objective lens. The discharge ends of the inlets are spaced apart from each other and from the exit which is near a POX reactor that combusts the mixture of fuel and oxidant exiting from the mixing vessel. To do makeup, the revolving cover is rotated with the revolving base, and simultaneously the brush is extended out of the cover unit. The washed solid portion is then transferred to a letdown zone, which is at a pressure less than the zone in which the solid portion was collected. The system also decrypts a file having adjusted portfolio information to provide security positions and calculates the intra-day net asset value proxy for the fund by applying prices received from a quote feed to security positions in the fund portfolio.