Samsung TV E-Manual page 297

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Using the QWERTY Keypad
If you have a USB or Bluetooth
for LED
keyboard
6500 Series and above, PDP TV
attached to the TV, and the screen is
displaying the QWERTY keyboard, you
can use the attached keyboard just like
a regular keyboard. Type a character
and the character appears on the
screen.
If you don't have a USB or Bluetooth