Application.Caption Property (Word)
Returns or sets the text displayed in the Title bar of the application window. Read/write String .
expression A variable that represents an 'Application' object.
To change the caption of the application window to the default text, set this property to an empty string ("").
This example resets the caption of the application window.
Application.Caption = ""
This example changes the caption of the Word application window to include the user name.
Application.Caption = UserName & "'s copy of Word"