I know how to assign them, that's how I found out that they existed to begin with. I didn't play WoW. This is my first MMO. There are, like, eight of them or so. What is each one? What do they do when you assign them?

What are/How do Target Markers work?

+1 Got disconnected today in the middle of a group mission and when I went to get back in I had a 2 hour queue. Outrageous.