The whole floor on one live order, table to kitchen to till.
For medium and large restaurants: a Windows sales POS at the heart, waiter app and order tablets on the floor, QR ordering at the table, a kitchen printer and kitchen tablet at the pass, and a customer order-ready screen, every part sharing one order.
The table (waiter or QR) opens the order, the kitchen fires it, the order-ready screen calls it, and the Windows till closes it, nothing re-keyed between stations.