In FrooxEngine, an update refers to execution of the main engine loop. During an update, physics are calculated, synchronization packets are sent, permissions are re-evaluated, and many other events and checks are performed. An update comprises both engine events and the update loop in a world. Every user in a session has their own local update time, or the time that it takes to step through an update. This value can be received with the DeltaTime ProtoFlux node.