GUI "Cracking"

[sambo]

Does anyone have the inside scoop on GUI cracking? From what I understand, it is the act of putting a form (or button) on top of a precompiled, secure GUI and making the new form (button) have the appearance of being inside the actual precompiled form.
My understanding is that this method can be used (if the developer has access to the tables behind the forms) to add to a prefabricated DataBase.

Reasoning: My company is in the process of purchasing some solution software that will not fully meet all of our needs. The idea is to add to the functionality of the precompiled DataBase code.

Any Suggestions...