A document is created and digitally signed using an author’s private key. A provider’s server receives a request from the client computer system to send a first object in an HTML page for display on the client computer system. The first gate electrode completely fills a space between two adjacent first isolation trenches, and the second gate electrode partially fills a space between two adjacent second isolation trenches, with substrate portions being arranged between the second gate electrode and the adjacent second isolation trenches, respectively. Polynucleotides comprising CKX promoters are also provided. For fine tuning production tolerances, the filters are supplied with a correction signal, which is applied to the other pole of the variable-frequency element of the filter as compared with the control signal.