But you should be able to know if someone is applying for a visitor visa and they're already in the system as waiting to come over, obviously. It's on those cases, just specifically, when people are rejected for visitor visas, that one of the most common check marks--and we've all seen the form--is that “we're not sure you'll return back at the end of your visa”. Also, when you've already indicated you want to come over and settle permanently because you're being sponsored, well, that's a big X against someone who's coming over to visit.
On February 15th, 2011. See this statement in context.