Originally Posted by
Eroginous
Are you talking about setting a focus?
Cuz there are much easier ways to do these things. Instead of setting a focus, use Gladius to show enemy player frames, it can show cast timers and whatnot, just like a focus frame can. The main difference is that Gladius is automatically enabled and set at the beginning of matches.
Then you can set up gladius clicks to bind to a particular ability, so that when you right or left click the Gladius frame with your mouse, it automatically uses that ability. Then you can also make macros that target a specific arena frame and cast an ability, so you don't even have to set a focus or change targets.
/cast [@arena1] spellname
/cast [@arena2] spellname
/cast [@arena3] spellname