The same person can belong to more than one group, so that his access rights correspond to the union of the access rights of each of the groups that contain him.

The definition of access rights is carried out by describing for each group of people the different groups of doors that are accessible and under what time constraints. The access rights are described in an annual calendar that describes the situation week by week. Because of the small variation in rights over time, a calendar can be initialized with typical weeks that describe a given rights configuration. The supervisor can create as many sample weeks as he or she wants. Changes made to a week are automatically propagated to all schedules that use that sample week.

The access control system should operate as autonomously as possible. A supervisor is responsible for the initial configuration and updating of the various information defining groups of people and doors. A guard has a control screen and is informed of unsuccessful access attempts. The alarms are transmitted in slightly delayed time: the update of the information on the control screen is updated every minute.