Samsung UN55D6000SFXZA - Manual (Page 272)

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English
5. If the current channel is compatible with both the HbbTV and non-HbbTV text-
input modes, activate TTX by pressing the TTX key twice.
● When the screen indicates (with the red button, etc.) that HbbTV is being
accessed.
● Press the TTX button once to enter the HbbTV text-input mode.
● Press the TTX button twice to enter the non-HbbTV text-input mode.