The ActivateOnline method exchanges license-related data with the Microsoft Clearinghouse server and, if successful, completes ...

The ActivateOnline method exchanges license-related data with the Microsoft Clearinghouse server and, if successful, completes system activation. It requires that the target machine be able to communicate through the Internet using the HTTPS protocol. If necessary, the SetProxySetting method should first be used to connect through a firewall. The method returns 0 on success and an error code otherwise.
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