Class name is a list of all the registered classes that have DLLs available on your system. The OS/2 operating system allows classes to be registered without the DLLs available, but Object Utility/2 does not. You can select a class from the list or enter one manually. The Class Name field is required when registering a new class, modifying an existing instance that was not dropped on Object Utility/2, or creating a new instance.