Glossary: Message

Objects are miniature self-contained programs. The only way to interact with them is via their member functions which are created by the object's designer who, thereby, defines exactly how the object may be used and keeps it at arms length from the user. To underline this concept of autonomous objects, accessing them via their member functions is often referred to as sending them messages; the name of the function being the name of the message. For example: "The TObject is sent the Draw message".
See OO Concepts: Objects & Classes
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