6ec415aa_Macro_for_Wow___Warcraft_Macro__Macro_conditional
[How it is used in a Wow macro] Returns TRUE if the selected modifier is pressed [The syntax] [modifier:type] or [mod] [Notes] Valid modifiers: shift, ctrl, alt. use just [mod] for any modifier press. SELFCAST is also a modifier for if you have that option enabled [Macro conditional] 
modifier
Complete list of Wow macro conditionals Wow Macro | Macro for Wow | Warcraft Macro
Macro conditional