A compact, portable, and user-friendly duct sanitizing apparatus and method, for new construction and retrofitting to existing air conditioning and heating systems, which can be professionally or nonprofessionally installed and then easily serviced by a non-professional. The policy functions are invoked, when, for example, a database server detects that a query is issued against the database object. Active regions are defined to have a major axis slanted to the word line direction and the bit line direction. Intelligent predictions of advantageous buffer forwarding are employed to transmit data caches over high-speed connections between communication nodes to mitigate data buffering issues relating to the transmission of large amounts of data over slower end links between communication nodes and end user devices. The invention further relates more specifically to a process for converting a feed stream comprising oxygenated lower aliphatic hydrocarbon compounds, especially methanol, to a product stream comprising aromatic hydrocarbons and olefins, especially BTX, which process comprises a step of contacting said feed with the catalyst composition according to the invention. The first constant voltage is a voltage which is smaller than the second constant voltage.