docs: public String cleanCommand(String command)
  	{
  		if (command == null)
  			return command;
  		Map<String,Object> properties = Util.parseArgs(null, command);
  		properties.remove(Params.APPLET);
  		properties.remove("code");
  		properties.remove("jnlpjars");
  		properties.remove("jnlpextensions");
  		properties.remove(ScreenUtil.BACKGROUND_COLOR);
  		properties.remove(Params.BACKGROUND);
  		return Util.propertiesToUrl(properties);
  	}