What in God's green earth are "Gameplay Tasks"?

Development Programming & Scripting
1

… and where can I find the mythical documentation

https://docs.unrealengine.com/latest/INT/BlueprintAPI/GameplayTasks/index.html

So descriptive…

2

I havn’t looked at it in a long time ( 2014 ), but the Strategy Game example/starter kit used a task system to control the AI and not the Behavior System.