public sealed class Sandbox.Utility.DataProgress.Callback : System.MulticastDelegate

s&box has a [CodeGenerator] attribute that you can use to decorate another attribute specifically for use with methods and properties. It lets you wrap methods and properties to perform some other action when the method is called or the property is set or to return a different value when the property is read.

You should not rely on the order in which the same callback methods get invoked for different GameObjects, it is not predictable. If you need more control, you should use a GameObjectSystem.

Adding the [Sync] attribute to a property on a Component will have its latest value sent to other players each time it changes.

Here's how you can use ActionGraph with your game code written in C#.