Syntax:        TXSETLPI(<expN>)

     Purpose:       Sets the number of lines per vertical inch to
                    print in you logical text area.

     Argument:      <expN> is the number of lines printed per inch.
                    The default setting is 6. Valid values for <expN>
                    are 1, 2, 3, 4, 6, 8, 12, 16, 24 or 48.

     Returns:        0  Successful
                     1  <expN> not numeric
                     2  Invalid value for <expN>

     Usage:         TXSETLPI() is useful anytime you need to change
                    the line spacing in midstream of a print routine.
                    You can use it to increase readability with larger
                    fonts or print entire report on one page using
                    smaller font.

     Example:       * Printer is set at default 6 lpi
                    @ 01, 30 say "Print Large Report Heading"
                    TXLNPRT85()  && select line printer font 8.5 point
                    16.67 cpi
                    _ret_code = TXSETLPI(8)
                    IF _ret_code = 0
                       (Print Routine to print @ 8 lpi )
                    ENDIF

     See Also:      TXCOPIES(), TXLMARGIN(), TXRMARGIN(), TXTMARGIN()