I'm not sure what you mean by "set the ';' key in isboxer, so I'll give you two answers.
1) The second screenshot provided by Va1entines shows that the ';' is sent to all windows in the first step. This is actually not correct, it should send ';' to all windows in the 2nd step only - as I explained right after the screenshot. So that's how the ';' gets sent to all windows through ISBoxer.
2) Once the ';' is sent to all windows, you may be asking how it is associated with your Proc Macros. To do this in WoW (arguably the easiest way), you have to associate the ';' key to a certain action bar slot. I use Bartender4 (the add-on) which allows you to associate any key press to any action bar slot. I used it to associate ';' with the 4th box on the 9th action bar, then made sure all my toons put their Proc Macros in that slot.
Hope this makes it clear for you!
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