Abstract: Mustering of persons from a building in an emergency situation is made possible by tagging mustering stations with unpowered, unique tokens which can be read by a user's personal mobile electronic device. The user's device transmits both mustering station identity and user identification to a remote server, where, upon successful validation, the user is removed from a list of persons to be mustered. The system may be part of a physical access security system for the building, in which single-use digital tokens as well as traditional cards may be used to open the doors. The permissions relating to doors or other physical assets may also be used to grant access to logical assets within the building.