You can close all documents open in Atlantis except the current one if you hold the Ctrl key down and click the "Close all documents" 
button of the "File" toolbar. Click for details...Choose a language with which you want to mark the selected text in your document. When spellchecking, Atlantis uses the language information accompanying the document text, to choose a proper spellchecker for this text.
If you do not want Atlantis to spellcheck the selected text, choose <none>.
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