content: tell application "System Events"
      set allWindows to name of window of process whose visible is true
  end tell
  return allWindows
  
  set theWindowList to my subListsToOneList(myList) --  Flattening a list of lists
  return theWindowList
  
  on subListsToOneList(l)
      set newL to {}
      repeat with i in l
          set newL to newL & i
      end repeat
      return newL
  end subListsToOneList
  