If I remember from past posts, it is the XP window is what figures out what class you are, and from there can figure out what spells and buttons to setup in the group and raid windows.
There is probabaly other stuff that uses the class derived from the XP windows also.
Just a comment on my part, I like the current xp window, since I can use the top bar to see all the different XP numbers and use the large one to show the one I am currently interesed in.
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