WoW API: IsModifierKeyDown

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Returns whether any modifier key is currently down.

isDown = IsModifierKeyDown();

Returns

isDown

Flag - 1 if ALT, CTRL, and/or SHIFT is currently down, nil otherwise.

For the WoD expansion 6.0 API, the return value of this function is no longer 1 ... it is a boolean TRUE.

if ( IsDown == 1 ) currently evaluates as true, but after the 6.0 API goes into effect it will evaluate as false, and an attempt to print the variable isDown will throw an exception/error.