Okay, in that case the universe connection that is used is dependant on the active user. So, one can define a user X and a user X_test that both use the same universe.
In supervisor you can set the universe connection for user X to 'production' and the one for X_test to 'test'.
No problem.
However I suspect you may run into trouble when you try to run 2 instances of BO from one desktop. I have never tried that, so perhaps you can check this out..
Ties Blom