Interrupts and CC - DPS Toggle?

[Bollwerk]

If you have multiple toons with interrupts, you can setup a key to round robin if you're using ISBoxer, which it sounds like.

http://isboxer.com/wiki/Round-robin

I you just want to only do a spell on one toon, then I'd suggest binding a macro on one toon to a key combo like CTRL-ALT-SHIFT-Something, then pick a more simple key like F1 or something and have ISBoxer setup to send the CTRL-ALT-SHIFT-something to only that toon's window when you press F1. The macro in WoW should be something like:
/stopcasting
/cast Wind Shear (or whatever interrupt you use)

I'm sure there are other ways to do this, but this is what came to mind.