virtual void receiveBacklog(BufferId bufferId, MsgId first, MsgId last, int limit, int additional, QVariantList msgs);
virtual void receiveBacklogAll(MsgId first, MsgId last, int limit, int additional, QVariantList msgs);
virtual void receiveBacklog(BufferId bufferId, MsgId first, MsgId last, int limit, int additional, QVariantList msgs);
virtual void receiveBacklogAll(MsgId first, MsgId last, int limit, int additional, QVariantList msgs);