FFI, pragma and co...

Hi

As some of us, I'm following the two lists (dev and beginner..) and there is a long interesting discusion about pragma, FFI, primitive...  but I don't really know them ;)  exept what I found on wikipedia lol

Can anyone indicate me pointers or maybe simple examples to understant that better ?
in general for the extension mechanism <   >

This is something I found "strange" when I first see them in smalltalk where everything is an object ;).
Primitives are objects ?

Thanks in advance

Cédrick

ps: I'm interested in Pragma as it's a kind of metadata as far as I have understood. But how to use them ?
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