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9 hours ago, R C-R said:

CMD+D is the keyboard shortcut for the "Don't Save" button in the 'would you like to save' window that appears after using CMD+W to close a document with unsaved changes:

Aha! Thanks for the clarification. After rereading the posts above, I see Old Bruce was replying to Krishna Prasad Kotti's post. I read his post as a stand-alone comment.

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On my MacBook Pro it is Command+W. D did not work.