You can add resources to a container's Rules & Resources folder, then use those resources to customize the look of the container, just as your administrator customizes containers. The resources can be: picture files Picture files can be used as backgrounds in the container's window panes. resource files (.rez) A resource file is normally added by your administrator. It can contain customized pictures, icons, forms, and sounds. These resources automatically replace the standard resources used by the container. The advantage to storing resources in a container's Rules & Resources folder, instead of in a settings file or your client's Images folder, is that FirstClass keeps track of the version of any resources in the Rules & Resources folder. This means that FirstClass will automatically update any resource when it detects that someone trying to view the resource has a copy that is older than the version in the Rules & Resources folder.