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Like the Initiative window (Which, by the way, I totally don't know how this works to begin with) but if it's API I need, where do I go to find that resource?
The API subforum is a good place to start. There are many users who are happy to help you write a script for this, if not recommend [adapting] an existing one.
There is no means to create new UI elements, with or without the API. The best you could probably do would be to have an API script updating the text of a handout.