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What does “window class registration” mean? Why is this needed?

There is a concept in Win32 API programming such as "Registering the Window Class".

It is performed using the RegisterClass()or functions RegisterClassEx().

What does the term “registration” really mean?

Why is this needed?

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When a window is created (throw CreateWindow / Ex), it must be associated with a specific class. This class must first be registered with the system. MSDN simply states:

A process must register a window class before it can create a window for this class.

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