A system and method are described for constructing and implementing generic software agents for automated tuning of computer systems and applications. The embossed textured article includes both peaks and valleys that are measured and quantified to determine a profile of the textured article. The first evaluation signal is supplied to the pressure generating element to measure a first ejected amount of the first liquid droplet. The variable capacitor is configured to allow the capacitance value thereof to be adjusted within the predetermined capacitance range and the one or more switched capacitors are configured to be selectively actuated to permit continuous tuning of the capacitor bank over a second capacitance range that is greater than the predetermined capacitance range. The invention also proposes a corresponding multicast service control device and a corresponding user entity. The main body includes a fixing portion and a rotating component received in the fixing portion.