World of Warcraft API/Protected Functions

API functions in this category are protected. This term is used for three main types of functions:

• API functions that addons (or any other insecure code) can NEVER call.
• API functions that addons (or any other insecure code) cannot call IN COMBAT.
• API functions that addons can only call from a hardware event (i.e. the user clicking a button), but not from OnUpdate/OnEvent handlers.