Scaleform displays a scrolling text box.

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BeginScaleformMovieMethod(scaleform, "SET_MESSAGE")
PushScaleformMovieMethodParameterString("THIS_IS_A_LONG_MESSAGE_TO_SEE_WHAT_HAPPENS!") -- the message to display
EndScaleformMovieMethod()

BeginScaleformMovieMethod(scaleform, "SET_COLOUR")
PushScaleformMovieMethodParameterInt(6) -- the message color
EndScaleformMovieMethod()