rem: return null; 
context:   QueryInterface : function(iid)  {    if(iid.equals(Components.interfaces.nsIMsgDBViewCommandUpdater))	    return this;	      throw Components.results.NS_NOINTERFACE;    return null;  }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/f1ea69808eba776b979a2ce0c73a36e2555cdc76/messageWindow.js/clean/mailnews/base/resources/content/messageWindow.js