A device for performing a handoff in a mobile communication system. These compounds are useful in the prevention or treatment of infection by HIV and the treatment of AIDS, either as compounds, pharmaceutically acceptable salts, pharmaceutical composition ingredients, whether or not in combination with other antivirals, immunomodulators, antibiotics or vaccines. The filter chambers arranged prior to the filter materials in the flow direction of the fluids for filtering. The disclosed multi-spool gas turbine engine provides improved part power fuel consumption at reduced output shaft speeds. The above may be embodied in a method, a program debugger and an article of manufacture.