A piezoelectric thick film element array includes at least one piezoelectric element structure having a thickness between 10 \u03bcm to 100 \u03bcm formed by a deposition process. A leaky bucket counter produces a new leaky-bucket count at predetermined cell slot intervals by adding an output rate parameter to the previous count, and then by subtracting therefrom a full rate parameter if a cell output request signal is active. The ceiling may be defined entirely by panels extending continuously from one end of the ceiling to an opposite end of the ceiling, arranged side-by-side with troughs in between. The method further includes determining a particular operating system used by the web server and selecting a command based on the particular operating system.