You want to do some picture-in-picture thing in LUA? Sorry, that will not be possible.
You will need an application to do some overlay rendering, and probably also at the edge of what is permitted (in wow).
What might be possible is to have a window from your char - or chars - which replicate the chat. You could probably also add a few buttons so you could get the char to cast a buff, a ress or a heal only outside combat.
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