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  Routine:      CBL_WRITE_SCR_CHARS_ATTR
 
  Function:     Writes a string of characters to the screen, giving
                them all the same attribute.
 
  Syntax:       CALL "CBL_WRITE_SCR_CHARS_ATTR" USING     screen-position
                                                          character-buffer
                                                          string-length
                                                          attribute
                                                RETURNING status-code
 
  Parameters:   screen-position        Group item defined as:
                  row-number             PIC X COMP-X.
                  column-number          PIC X COMP-X.
                character-buffer       PIC X(n).
                attribute              PIC X.
                string-length          PIC X(2) COMP-X.
                status-code            See ◄Key►
                                    -♦-