8.3 Using the Tracing API
  There 
are three levels of interaction with the tracing system:
-  Beginning user can easily control which objects are participating in tracing;
 -  Intermediate users can extend the tracing system to modify the output format 
generated or use existing trace sources in different ways, without modifying the 
core of the simulator;
 -  Advanced users can modify the simulator core to add new tracing sources and 
sinks. 
 
 
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