This feature has been working since windows 2k or early versions of XP, and still many people do not know about it.
If you have a Message Box showing, and you want to copy its contents, you can just Ctrl-C when the window is focused – you will hear a beep and the contents of the Message Box (including buttons and caption) will be loaded into your clipboard.
Very useful when having to copy a long error message somewhere or when a message box used for debugging displays too much information.
Note though, that apps that use non-standard message boxes will probably not have that feature enabled.
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