Not sure about the darqui updater part, but I have done the 2nd folder of everquest, and tested it with the default ui for the 2nd monitor boxed acct, and the main monitor acct, using darq, profit, drums, and all worked.
But like I said, not sure about having 2x updater of darq, but I don't see why it wouldn't work, cuz each updater would point to the folder that it is currently in. Like when Beta was active, and you copied the files to beta server, and also had your live server.
Good luck.
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