Let's Get Technical – Delphi is an object oriented programming language. Unless you write nothing but console applications, this fact is obvious. For example, when your application includes either a form or a data module, the class that defines the form or data module is a descendent of an existing class. In the case of a form, it is a TForm descendant, and in the case of a data module it is a TDataModule descendant. This process of extending an existing class, especially one that is not TObject, is used extensively by the visual component library (VCL), and to a lesser extent in the runtime library (RTL). ...
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