How do I take a screenshot of just one screen?

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Tags

1. #screenshot
2. #screen
3. #whatever
4. #place
5. #which
6. #paint
7. #window
8. #prtscn
9. #email
10. #anyway
11. #keyboard
12. #paste
13. #otherwise
14. #cursor
15. #there
16. #screens
17. #program