As mentioned in a post only a few above this one:

"The rule of thumb on all the corp codes being posted. They have the right to ask for id; doesn't mean they all will (quite often they don't), but it is a chance that's taken. Some people have back-up reservations at another property in case they're asked for id/don't have it, or know they can get hit w/ rack rate if they can't."

They'll ask for corp id or a corp biz card matching the name of the corp code being used.

Cheers.