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While that page definitely has some useful & nicely put together information, it's always a very good idea to add a warning when linking to pages from that site. Why?

From the front page:
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So in short, that site is written ONLY for AmigaOS4. So if some thing has changed, only the "OS4 way" will be presented (without any compatibility notice).

It's just way too easy to google for something, find links to that page, start reading, and when your code no longer compiles, realize what you just read (and wrote to your code) applied only to OS4...