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  • Official comment

    This type of topic has no data of its own but points to another topic (the master) that has data. It effectively allows a topic's data to be shared across more than one topic node. If the master topic is updated then all slave topics are effectively updated and so subscribers will receive updates.

    If a topic is removed that is pointed to by Slave topics then all such Slave topics are also automatically removed.

    Actions performed on the slave (such as updating it) have the same effect as performing the action on the master.

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