What is one of the best GUIs you’ve used?


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What is one of the best GUIs you’ve used?


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(What is one of the best GUIs you’ve used? What makes it so great (look, ease of use, complex calculations)? What are the action events and action listeners of the program?

Blackboard is a GUI. What are your thoughts about it? As you are typing the answer to this question, what is the action event and action listener?