What 1996 model cadillac has the backseat far rear window that opens too?

my father in law is buying us a 1996 cadillac sedan, but he doesn't remember the model. He says the second small window in the backseat opens. Just wondering if their is a specific model that does that, or if they all do?What 1996 model cadillac has the backseat far rear window that opens too?I dont believe ANY 1996 model Cadillac has that option, maybe like a 1956 but not 90's...