Message Function in-games.

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To make a Message Function, like a GUI, or something, how would it work?
Note: when they have a / it means it's one of the two, so correct me there.
[lua]m = game.Parent.?.msg
m = msg.text = "hio"
wait(100)
m:Remove()[/lua]

Please tell me if my scripting is off, I'm trying to remember my basics.

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But it's got to have a Parent, correct?