6ec415aa_Macro_for_Wow___Warcraft_Macro__Macro_conditional
[How it is used in a Wow macro] Returns TRUE if the target of this conditional set exists [The syntax] [exists] [Notes] also can check if you have a focus with @focus, always use with @mouseover [Macro conditional] 
exists
Complete list of Wow macro conditionals Wow Macro | Macro for Wow | Warcraft Macro
Macro conditional