Perl is correct in that we’re not really able to provide specifics on it, Gophendax. It’s part of the permitted but not supported stance we have there.
There are a number of sites that discuss common multi-boxing practices though, which may be helpful to you.
To be a little clearer about the post you linked, Gophendax, that seems to be on the Overwatch forum. I can’t imagine a single instance where using Autohotkey for Overwatch would be appropriate.