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Every time you navigate to Admin>Setup Wizard > Organization Credentials (/rhn/admin/setup/MirrorCredentials.do), SUSE Manager connects to SCC checking your subscriptions and available products.

SUSE Manager Server itself, being based on SLES 12 SP3, uses the normal SLES registration means (aka 'SUSEConnect') to register itself with SCC. See the SLES documentation for further details.