What is the state of the user interface?

What is the state of the user interface? Can you give me an example of what could be? Does this apply to things like tracking which tab is open, for example?

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I think the idea is that the application has a state, and the user interface reflects this state.

So, when you launch the application, it looks like this

1) The initial state (the application is running)
2) Loads the initial data ("loading state")
3) Ready for interaction ("ready state")

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http://www.wisdom.weizmann.ac.il/~harel/papers/Statecharts.pdf

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