Registering a user in vBulletin database from other system

[lettebasse]

Hi guys, we are connecting our vBulletin with a new system we programmed from scratch, and we will be handling users registration from this new system. After a user registers in the system that has it's own database, we also need to create that user in the vBulletin database, so he can also use the forum. How should we do this ?
The creation of a user in vBulletin only adds records in the "user" table ? Or do we need to add or modify something else in the database?

Many thanks