What is the difference between anti-passback on a Global, KT-NCC, or Multi-Site Gateway?

Muti-site gateway: Anti-passback is local to the controller.

Global gateway and KT-NCC: Anti-passback on the Global gateway and KT-NCC are global functions which can be implemented with the areas. There are various levels of anti-passback that can be programmed on the Global and KT-NCC gateway, such as Normal Supervisor, or Normal and Supervisor.