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Local and global publications
A publication that is made available through all the brokers on a network is called a global publication. If required, access to publications can be restricted to subscribers that use the same broker as the publisher. This is called a local publication, and it can be specified when the publisher registers with the broker, or each time it sends publications to the broker. Local publications are not forwarded to other brokers.
Subscribers can specify whether they want to receive local publications or global publications (but not both) when they register with the broker. Subscribers subscribing to global publications do not receive local publications, even if they are published at the same broker that their subscription was registered at.
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