Hello Administrators !

I'm trying to find a way to find if a system is registered or not (SLES 11sp1) .
I've tried suse_register but it has not a parameter that would tell me if the system is already registered.
I've tried to check it other way -> through Yast I started the registration module. But All information I got was that no repositories were needed to change.
Is there any other way (if possible a command) that would prove that a system is registered or not ?

Best regards,

Dynio