Each control is defined and described. Also a half-dozen Classes are featured. According to this article, Visual Basic 7.0 will allow free-threading. Constructors allow you to create a new instance of a class while simultaneously passing arguments to the new instance. Part 2 of this 5 part series on the forthcoming VB 7 enhancements focuses on polymorphism.
Polymorphism is related to inheritance.
The term refers to the ability of functions in child classes with the same name as those in parent classes to behave differently in the child.