Originally Posted by Phanx
There are three main categories of protected functions, and some functions may fall into multiple categories, or may behave differently under different circumstances.
1. Functions that are completely protected, and can only be called by Blizzard code. There is probably no point in including functions like CastSpellByName that are always in this category, since they cannot be used by addons.
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Except that CastSpellByName can be called via a hardware event if the name being passed is that of a tradeskill - yay Blizzard!