A licensing server source distributes a so-called license configuration file to a client for purposes of enabling operation of a software application installed on a computer. The tunable bandwidth selector may include a plurality of spaced apart electron sheets which selectively separate a first bandwidth from an input spectrum. The concentrated fluid is mixed with a pressurized venturi-operating fluid, typically water, before being suctioned through an atomizing discharge port and entering the conduit to be cleaned. The finger is flexed outwards for insertion of the axle within the axle receiving bore, and flexed inwards to insert the detent into a notch of the axle once the axle is inserted in the axle receiving bore. The second wall is opposite to the first wall.