So, if you're sure it's the right thing to do, I would suggest that
the easiest thing is to simply gray the "new document" menu item when
a document is opened or created, and enable it when there a document
is closed. With the "open document" option, you should ask to save,
close without saving, or cancel before presenting the standard open
dialog.
And remember to handle cases where the user selects and opens multiple
documents from the Finder.
Jonathon Mah
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