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An ObjectMessage is sent to AnObject and consists of the ReceiverObject (someObject in the following example), the InstanceMethod that is being called (doSomethingWithObject:andAnotherObject: in the example), and any arguments that are passed to it (theFirstObject and theSecondObject in the example).

[someObject doSomethingWithObject: theFirstObject andAnotherObject: theSecondObject];

usually just called “Message”, but we can’t make a link out of that and MessAge is just too, uh, mess-y

And, in fact, you can send an ObjectMessage to a ClassObject, since a class is an object in our neck of the woods.

see also MethodSignature

see also SeLector