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 The LONGEST edit macro will place message lines around the longest text line in
 the file being edited.  You simply type LONGEST on the command line and press
 .  LONGEST then searches through the file and finds the last non-blank
 byte on every line.   When it has gone through the file, it marks the line in
 which the last non-blank byte is the farthest out.  It marks it with ISPF/PDF
 editor "message" lines and it indicates which byte contains the last non-blank
 character on the line.  You are positioned to the longest line as well.