How can I prevent user of application from escaping to desktop?

Hello, forum.

I'm student who doesn't have much experienced with Windows programming.
I've been mostly programmed windows application in C/C++ using Windows API, though recently leaned basics of C# a little.

What I want to try this time is to prevent user from escaping to desktop while using the application. IBT TOEFL examination application might be doing what I wish my application to do to prevent cheating.

I searched but couldn't find good explanation about it.

Sorry if any part of this article was rude or wrong, I don't speak English that much.

Thank you.
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