Syntax:        TXDOTHLINE(<expN1>,<expN2>,<expN3>,<expN4>)

     Purpose:       Draws a vertical line at the designated x and y
                    coordinates with a width of <expN3> and <expN4>
                    dots high. TXDOTHLINE() allows you to draw a
                    horizontal line with great control over the line
                    placement.

     Arguments:     <expN1> is the x coordinate of line to be drawn.

                    <expN2> is the y coordinate of line to be drawn.

                    <expN3> is the width of your line in dots. 300
                    dots equal 1 inch.

                    <expN4> is the weight of the line. (Number of dots
                    high). 300 dots equal 1 inch.

     Returns:        0  Successful
                     1  Invalid number of parameters
                     2  <expN1> x parameter not numeric
                     3  <expN2> y parameter not numeric
                     4  <expN3> width parameter not numeric
                     5  <expN4> weight parameter not numeric

     Usage:         TXDOTHLINE() is useful anytime you need to draw an
                    exact horizontal line of any width (width).
                    TXDOTHLINE() is much more exact than TXCOLHLINE()
                    and requires calculating your exact print
                    position. 300 dots equal 1 inch.

     Example:       * To print grid on a page.
                    for i = 1 to 2400 step 75
                       TXDOTVLINE( i, 01, 3300, 1)
                    next

                    for i = 1 to 3000 step 75
                       TXDOTHLINE(01, i, 2400, 1)
                    next

     See Also:      TXDOTVLINE(), TXCOLVLINE(), TXCOLHLINE()