Making a word document active

Delphi 4 and Word '97/2000

Hi All

Please picture that I have MS Word running with several documents open. How
can I make a document the currently active one so that I can close it using;

SaveChs := wdDoNotSaveChanges;
  Word.ActiveDocument.Close(SaveChs, EmptyParam, EmptyParam);
?

Kind regards

Glenn Greatwood