A cutting insert comprises first and second polygonally-shaped main faces arranged substantially parallel to one another, and a side face structure interconnecting the first and second main faces to define a peripheral edge. A direction control device thereof comprises a handlebar, a steering stem, two adjusting stems, and a quick switch device. An entity may request that the frequency of a clock of the processor of the digital system be changed. Trace data as stored in the external memory includes a trace data source identity value, and a time stamp value indicating when data was collected.