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 twVLine( nRow, nCol, Length, lType, wColor )
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     Display a vertical line at specified relative window coordinates,
     in a chosen type and in a specified colour in the active window.
     The length and line type must be passed for the function to work.

       Arguments:

     nRow,nCol   - 'N' Relative Window Coordinates.  Defaults to 1.

     Length      - 'N' Length of the line in characters.

     lType       - 'N' Type of line to display:

                         "|"   1 - single
                         "|"   2 - double
                         ":"   3 - dotted
                         "|"   4 - dashed
                         "."   5 - heavy dotted
                         "#"   6 - left thin
                         "#"   7 - right thin
                         "#"   8 - thick
                         "#"   9 - light shaded
                         "#"  10 - medium shaded
                         "#"  11 - heavy shaded
                         " "  12 - spaces

     wColor      - 'C' Clipper colour attribute. Defaults to
                       SETCOLOR().

       Return:

     Current window handle.

       Example:

     twVline( 5, 28, 8, 8, "b/bg" )

     Displays a thick line in blue/cyan starting at relative window
     coordinates 5,28 and going downward for 8 lines.