That, is macro code using one of ISBoxers inbuilt variables (the {FTL} part will be filled in when the macro is exported to the ISBoxer addon). You can use it if you create the macro inside a WoW macro keymap within ISBoxer. If you prefer your macros in game, then just use the FTL keymap like the DPS keys do, or use the "but first" options when setting the wow keystroke.
ISB is extremely flexible, and I would advise build all-purpose macros such as this one right inside ISBoxer to save typing it out for every toon in every team.
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