Arbitrary arguments chosen by the sender of the message. If num_args > 0, you can access args[0] through args[num_args - 1] (inclusive). What these arguments mean is up to the sender and receiver. None of the valid items are NULL.
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Arbitrary arguments chosen by the sender of the message. If num_args > 0, you can access args[0] through args[num_args - 1] (inclusive). What these arguments mean is up to the sender and receiver. None of the valid items are NULL.