Mirror/doc/Guides/Communications/NetworkBehavior.md

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# NetworkBehaviour Callbacks
[![Network behaviour callbacks start cycle video tutorial](../../images/video_tutorial.png)](https://www.youtube.com/watch?v=SNgYIhBHW1w&list=PLkx8oFug638oBYF5EOwsSS-gOVBXj1dkP&index=5)
**See also <xref:Mirror.NetworkBehaviour> in the API Reference.**
Like the Network Manager callbacks, there are a number of events relating to network behaviours that can occur over the course of a normal multiplayer game. These include events such as the host starting up, a player joining, or a player leaving. Each of these possible events has an associated callback that you can implement in your own code to take action when the event occurs.
When you create a script which inherits from `NetworkBehaviour`, you can write your own implementation of what should happen when these events occur. To do this, you override the virtual methods on the `NetworkBehaviour` class with your own implementation of what should happen when the given event occurs.
This page lists all the virtual methods (callbacks) that you can implement on `NetworkBehaviour`, and when they occur.
## Server mode
**When a client connects:**
- `OnStartServer`
- `OnRebuildObservers`
- `Start()` function is called
## Client mode
**When a client connects:**
- `OnStartClient`
- `OnStartLocalPlayer`
- `OnStartAuthority`
- `Start()` function is called
## Host mode
These are only called on the **Player Game Objects** when a client connects:
- `OnStartServer`
- `OnStartClient`
- `OnRebuildObservers`
- `OnStartAuthority`
- `OnStartLocalPlayer`
- `Start()` function is called
- `OnSetLocalVisibility`