In Schneider Electric terminology, a (often abbreviated as Ref. ) is a unique alphanumeric code used to identify a specific software product, license type, or hardware dongle.

: Log into the License Manager if you registered online. Current Installation : Open Vijeo Designer. Go to Help > About .

The importance of the serial number cannot be overstated. Upon installation, users are prompted to input this code to unlock the full capabilities of the software. A missing or invalid serial number relegates the user to a demo or limited mode, often prohibiting the ability to transfer projects to physical HMI hardware. Furthermore, the serial number acts as a proof of purchase and authenticity. In an era where industrial cybersecurity is paramount, using legitimate, serialized software ensures that the code has not been tampered with and protects the end-user from the vulnerabilities often found in pirated or "cracked" versions. It is also the primary data point required when contacting technical support; without a valid serial number, access to official firmware updates and helpdesk assistance is typically restricted.

– Posting a photo of your DVD case on a forum reveals your serial number to the world. Fraudsters will use it to generate fake licenses.

By documenting your references, storing physical dongles securely, and distinguishing between PC licenses and HMI runtime serials, you can avoid the most common pitfalls that lead to costly downtime.