Game Development Reference
Adjacent to the package browser is the class tree browser. Most of the IDEs we'll be working
with will include a class tree as well. The tree browser allows us to dig deeper into the code
by seeing exactly how each and every class in UDK are connected to one another.
You'll notice that all classes in UDK extend from the Object class. It's the base class for
everything in the game and allows for everything in the game to share some common
properties and functions. Actor is perhaps the class you will be most concerned with
however, as it is the base class for all gameplay objects in UDK.