What does 'this system registered to RHN classic' in /var/log/messages mean ?

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Issue

What does 'this system registered to RHN classic' in /var/log/messages mean ?

when the customer tried to register their system to RHN using rhn_register command, they saw message 'this system registerd to RHN classic' in /var/log/messages.
What does this mean ?

Environment

Red Hat Enterprise Linux 5.x

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