VBA Interfaces
Introduction
An Interface is a way to define a set of behaviors that a class will perform. The definition of an interface is a list of method signatures (name, parameters, and return type). A class having all of the methods is said to "implement" that interface.
In VBA, using interfaces lets the compiler check that a module implements all of its methods. A variable or parameter can be defined in terms of an interface instead of a specific class.
