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If the canonical name in the response CNAME record does not match the one specified for the resource, the Online function tries to update the CNAME record on all authoritative master name servers in its domain (those master name servers that it can reach and where it has update permission). If the DNS update was successful, or was not necessary on at least one of the name servers, the Online function creates an online lock file. The monitor agent function checks for the existence of this file. The Online agent function does not create the online lock file if it is unable to update at least one domain name server.
A stealth server is a name server that is authoritative for a zone, but is not listed in that zone's NS records. If you specify the StealthMasters attribute, the Online agent function tries to update the name servers specified in the StealthMasters attribute.
In BIND 8 and above, the primary master name server on receiving an update sends notification (NOTIFY) to all its slave servers asking them to pick up the update.