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You'll receive this snac when another client send you a message on channel 4 thru server. ICQ clients use this snac to send messages to an old/offline/invisible clients if message type != 1 or message flags != 0 (for example plain-text multi-recipient message to an offline client) but this doesn't mean that you will never receive usual channel 4 plain-text message. See also additional information about online userinfo block.
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