new and need help controlling my healer

I have a lock and a priest. Actually the priest is my wive's, but she plays less now. I dual box on one computer and play both on independently controlled/configured screens, side by side. I play them in a window so I can smoothly move the mouse back and fourth. I can play both ok for PVE stuff, mostly. I am not trying to do anything illegal, but it may be illegal, what it is I am trying to do, so stick with me.

I want to have the priest just follow me around and click the same button over and over, every 5 seconds or so. I have seen some programs that send keystrokes cloned, but I don't want them all cloned. Even if I could 'connect' say my casting of corruption to her casting of this one button, that would work. I used to play the accounts on seperate computers a long long time ago, and used a program called mymouse that just clicked every 6 seconds, then set up a macro that /targeted me, /followed me, /cast shield /cast renew and it worked great. But I can't seem to make this easier on mone computer. There used to be a way to make her even auto target people in the raid with low health.

Anyway, is there a legal way to map me clicking corruption or something else to her clicking a button? But limiting it to only that one button?

what you want is classed as automation and illegal in the current TOS.

to accomplish what you need - pickup one of the many software applications that duplicate keystrokes between machines and only pass through the keys you require on a white list, you will have to press a key when you want the spells to renew. also if you are dual boxing the accounts need to be in the same name, otherwise you will face the prospect of a ban