code: public static DServerClass instance()
  	{
  		if (_instance == null)
  		{
  			System.err.println("DServerClass is not initialised !!!");
  			System.err.println("Exiting");
  			System.exit(-1);
  		}
  		return _instance;
  	}
docs: Get the singleton object reference.
  
  This method returns a reference to the object of the DServerClass class.
  If the class has not been initialised with it's init method, this method
  print a message and abort the device server process
  
  @return The DServerClass object reference