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In win32 API programming, there is a concept like “Registering a Window class”.
It is done using the functions RegisterClass() or RegisterClassEx().
What does it actually mean by the term “Register”?
Why is it needed?
When a window is created (throw CreateWindow/Ex), it must be associated with a particular class. That class must first be registered with the system. MSDN simply states:
It is needed because that is how the API defines it. The documentation does not elaborate on what goes on under the covers because that is unnecessary information for a programmer (and the exact implementation can change in updates). You are programming against the interface, not the implementation.