Set Tabs Visible
  Determines whether tab characters are visible or invisible during editing.
  Usage notes:
  o  By default, tab characters are invisible---appearing as blank space.
  o  Visible tab characters appear as a small HT. This is an editing
     convenience only---no effect how tab characters appear in print.
  o  To save your setting for future editing sessions, use SAVE ATTRIBUTES
     to create a section file or to create or update a command file---see
     help on Attributes.
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  Related topics:
     Attributes     CONVERT TABS     SET TABS     TAB