code: public void registerCommandHandler(String key, CommandHandler handler) {
          if (TraceComponent.isAnyTracingEnabled()
              && tc.isEntryEnabled())
              SibTr.entry(tc, "registerCommandHandler", new Object[] { key,
                                                                      handler });
  
          // Add handler to table
          // Note that if there was already a handler with this key it's table
          // entry will
          // be overwritten
          synchronized (_registeredHandlers) {
              _registeredHandlers.put(key, handler);
          }
  
          if (TraceComponent.isAnyTracingEnabled()
              && tc.isEntryEnabled())
              SibTr.exit(tc, "registerCommandHandler");
      }
docs: /*
  @parm key
  
  @parm command handler