OK, that's the code words for "most keyboards work." And Samsung can't list them for a few reasons. First, the list would be in the thousands with only a few that might not work. Also I read it supports Bluetooth keyboards.
That's pretty cool so try this one -> http://www.amazon.com/AmazonBasics-Bluetooth-Keyboard-Travel-iPhone/dp/B005EOWBKE
"Since many people are asking: It works with any bluetooth enabled device that supports HID (which 99% of the devices out there supports already). I have tested it with iPad 2, iPhone 4S, Windows 7 laptop, Macbook Pro, Blackberry Playbook and Asus Transformer."
Again there is no list. In my opinion Samsung should sell a 200 buck keyboard for those that must avoid any "trying" of a keyboard.