loading two clients

I am trying to load two of the wow clients but the second wow doesn't actually load up...I can log in by typingin the password but its completely blank...I can even log into the game but only the first client I open can be viewed...the second one is unviewable? Does anyone have an answer? I Know its not the pc because I can run two retail versions with full addons and ok graphics at the same time wth no problem. (this is not me saying anything about retail being better I am just wondering whyi cant get two clients to show and using it as a reference to I know its not pc)

What you trying to load with isboxer? Hotkets etc?

I am talking about just having two accounts open on two different screens. Like opening one wow client then double clicking and opening the second one. The second one isn't visible but I can hear all of the music and noises.

Have you tried them both in window mode and drag one across and maximum it?

when I try to load it in windows mode it says something like could not load 3d acceleration or something

Tried DX9 or reinstalled GPU drivers?