TVHLIN(row.i4.r, col.i4.r, nchar.i4.r, color.i4.r [,style.i4.r])

	tvhlin_c(row.i4.v, col.i4.v, nchar.i4.v, color.i4.v [,style.i4.v])

	Draw a horizontal line on the TV screen starting at 'row', 'col'
	and having a length of 'nchar' characters.

	row		row of line
	col		column of left end of line
	nchar		length of line in characters
	color		color of line (constants are in cnsparam)
	[style]		(LINE_THIN -> thin line (default),
			 LINE_THICK -> thick line)

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	tvvlin(_c), window_hline_c, window_vline_c, window_box_c,
	window_rectangle_c, tvbox(_c), wtvbox_c