How did the structure of the early Windows API generally contrast with the Macintosh Toolbox?

Answer

Windows API was more rooted in a procedural C-style structure.

While the Macintosh Toolbox was tightly integrated with object-oriented concepts, the early Windows API was rooted more in a procedural C-style structure relying on message loops and window handles.

How did the structure of the early Windows API generally contrast with the Macintosh Toolbox?
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