The process starts with the registration of persons in the Access control system. Personal data is stored in the database mostly under a unique personal ID number. Essential in the registration process is the allocation of an access ID number, usually together with a token of this number. However, biometric ID does not always require a physical token.

After registration, the biometric enrolment is done at a biometric reader connected to a client PC containing the biometric enrolment software and the AEOS software. After enrolment the template is distributed to the connected biometric readers in the Access Control system. The enrolment process user interface is fully integrated in AEOS and is based on the biometric vendor's enrolment software tools. The new templates and other enrolment data is stored in the Access Control system's database and are linked to the person's ID. If necessary the new template can be verified against all templates in the database to prevent multiple enrolment (enrolment of the same person under two or more different names)