Indicates the beginning of the time interval that is to be measured (accumulated) for the Duration object. Once the interval has completed, the application will call the stop member function.
void start([optional] Accumulator *pAccumulator);
Listener *listener = new Listener("sampleApp", "4.0",
NULL, false);
Duration *readTime = listener->durationFactory("duration of read");
readTime->start(NULL);
...