code: public static synchronized ClientConnectionManager getRef()
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(tc, "getRef");
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(tc, "getRef", instance);
          return instance;
      }
docs: Returns a reference to the single instance of this class in existence.
  The class must have been previously initilised by a call to the
  "initialise" method - otherwise invoking this method will generate a
  runtime exception.
  This class implements the singleton design pattern.
  
  @return ChannelFramework A reference to the only instance of this class
  which exists.