[Openal] Initializing effects extension

[Margin Marh]

You was right it fixed the error but before i go to tutorial 2 i don't
understand 2 parts in the code...What does this part means :
>
> alGenEffects    = (LPALGENEFFECTS)alGetProcAddress("alGenEffects");
>         alDeleteEffects =
> (LPALDELETEEFFECTS)alGetProcAddress("alDeleteEffects");
>         alIsEffect      = (LPALISEFFECT)alGetProcAddress("alIsEffect");


I dont understand that part very well so some explanation would be welcomed
:)
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