If any changes have occurred, the service tag data is automatically sent to the Oracle Product Registration System, as follows:
During an initial reboot after an installation or upgrade
When you reboot your system after an installation or upgrade, information about newly installed products is automatically sent to the Oracle Product Registration System.
During subsequent reboots when system configuration changes have occurred
After an installation or upgrade, if the product database has changed, information is automatically sent to the Oracle Product Registration System.
Explicitly, by using the regadm register command
Using the regadm register command to register your system is essentially the same as performing a reboot of the system. If any system configuration changes have occurred, product registration occurs immediately upon running the command. The configuration data is transmitted to the Oracle Product Registration System automatically, without needing to reboot your system. For more information about using the regadm command to register your system, see How to Register Your System by Using the regadm Command.
To obtain information about your registered products, go to https://inventory.sun.com/inventory/data.jsp. For general information about service tags, go to http://wikis.sun.com/display/ServiceTag/Download+OS+Service+Tag.