What. IS THIS

I have question, you gotta watch images to realise, there is about 15 almost shame shadow priests, most have diff gear, all of them have name with 1st and second letter that is the same, all are of same guild, they are doing everything in the same time(got renewed about 20 times in the same time) is this script? Hack? Bots? What is that?

http://imgur.com/a/BYHlJ

This is called Multiboxing. There is entire sub-forum here on our forum and that's completely legal.