It is an arrangement whereby some sort of arrangement is put between the individual and the business in which he's operating--in other words, in somebody's office or whatever--so that files that relate to something where there is a potential conflict would not be shown to that person, generally. There'd be a screen basically between that person and whatever might create a conflict situation.
We have some of those up on our website reported now. They are in a sense an alternative to the recusal mechanism. If you have the screen, you would not normally need a recusal unless it hits you suddenly, unexpectedly, from somewhere.