A novel method and apparatus for treating wastewater is described which involves the use of a downflow bioreactor filled with active anaerobic granular biomass. Voters use vote stamp to vote on ballot. A virtual trusted runtime BIOS can be managed by the virtual machine monitor. The print controller, in turn, writes the variable values to a jump table in the random access memory, writes the functions to designated portions of the random access memory, and writes starting addresses of the functions to the jump table.