A method and system for power control for Radio Frequency Identification tag reading is provided. Thus, in a case of the manhole mounted on a vehicle road, the manhole cover is prevented from being separated from the manhole frame without permission by a vehicle running at a high speed as well as from frictional noise generated between the manhole cover and the manhole frame. Users can register for categories that interest them, from an available set of categories. Providing at least two images comprises providing a first and second image, wherein the surface is illuminated using a first and second source of illumination, or providing the first using a source of illumination and providing the second from the first. The foamable suspension gels contain at least one pharmaceutically active agent that is sparingly soluble to insoluble in water, a second pharmaceutically active agent, and optionally a third active agent.