Sometimes you have an object that already does what you need to it to do, for example the GTK+ library.
Now, you come along and already have this great app that interfaces to Windows using another class.
Now you want to port that program to GTK+, you write a small wrapper around GTK+ that implements the functions required, and swap out the Windows class with the GTK+ class, and now your program has GTK+ as it's window drawing tool, and the class essentially is like a wrapper around a candy bar. It protects and provides a clean way to access the underlying candy!
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS