A friend of mine worked on the netflix debugging tools for a majority of their players (tvs, blu-ray players, consoles, etc) and there are a number of remote combinations like that inside the players to bring up all sorts of goodies.
I'd love a combination to keep Netflix signed in on my Samsung TV. It's something like a 50/50 chance every time I load it that I have to sign in again.
I'd suggest grabbing a dongle. TV-based apps are notoriously buggy overall and rarely updated to fix bugs.