Set<String> s = disabledSubsystemsHolder.get( );
Set<String> s = data.get().disabledSubsystems;
    public static boolean isDisabled(String id)    {    	Set<String> s = disabledSubsystemsHolder.get( );    	if ( s == null || id == null || ! s.contains(id)) return false;    	return true;    	    }