When you install MapInfo 12.0, the serial number you enter determines your license type: Node-Locked (Third character 'N'):
If MapInfo 12.0 was previously installed, you can often find your active serial number in the installation directory by opening UserInfo.log in Notepad. Windows Registry: For 32-bit installations, you can look under mapinfo professional 12.0 serial number access code
Allows multiple users within a company to share licenses. Requires a License Server name and port. Distributable (Third character 'D'): When you install MapInfo 12
If you have lost your credentials, they are typically found in the following places: Original Purchase Email: When you install MapInfo 12.0
This is a single-user license tied to one computer. It requires automatic or email activation. Concurrent (Third character 'S'):