What is this Error?

It seems to be a common Windows alert, and is sometimes a problem to fix. But first, where do you end up if you use the Switch To option?

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Actually nothing will happen…

You can get this error if you try to do something that takes a long time (not responding) and you try to do something else with it.
One example being copy something complex in one instance of SU and try to Paste it in another before the copying has finished.

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