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based on an earlier version of the Wolfram Language.
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WindowTitle

WindowTitle
is an option that specifies the title to give for a window.
  • For notebooks, WindowTitle->Automatic makes the title be the name of the file in which a notebook is stored.
  • The title given for the window does not need to have a connection with the name of the file in which the contents of the window are stored.
  • Not all settings for WindowFrame leave room for a title to be displayed.
Let the title be set dynamically to the value of :
 
Let the title be set dynamically to the value of :
Open a document:
Set the window title to give the full path of the document file:
WindowTitle should be set to something that formats as a simple string of text:
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