I wanted to make a 3 mage frost nova macro and here is the setup:

Mage1:
#showtooltip
/stand
/castsequence Frost Nova,,



Mage2:
#showtooltip
/stand
/castsequence ,Frost Nova,



Mage3:
#showtooltip
/stand
/castsequence ,,Frost Nova

When I click the button, all of them released the frost nova.. I'm wondering if the empty ',' does not work?