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Message: [QUOTE="Rick DeNatale, post: 4584835"] Well, actually they each have one instance, which is created at the same time they are (or vice-versa). This is the sense that they are 'singletons'. And I can think of at least three other classes which have single instances and can't be 'further' instantiated, although I've never heard NilClass, TrueClass, and FalseClass referred to as singleton classes. And superclass seems unsure about them from release to release. Right, as far as I can see it only comes up in the error messages when you try to subclass a class which has the FL_SINGLETON flag bit set. [/QUOTE]