A web-based hosted solution through which business entities create and manage communications campaigns, such as interactive campaigns that afford target recipients an opportunity to be connected to a third party call center. The phases, the frequencies, andor the duty ratios of the alternating current components of the voltages applied to the plurality of the toner carriers are made to be different, whereby the toner supply amount for each toner carrier from the developer carrier is controlled independently of the development electric fields between the toner carriers and the image carrier. The fumigant compositions also have low toxicity and low Global Warming Potential. Accordingly, when an urgent message is received from a provider or a specific user, it is possible to quickly transfer the contents of the received urgent message to other users without recreating a separate urgent message. The disclosed targeting is useful for delivering therapeutic and detectable agents to cancerous cells and tumors. The movable valve can move relative to the fixed valve so as to control the air flow.