status.i4.v = window_hscroll_c(window_id.i2.v, direction.i4.v

	This routine scrolls the window indicated by "window_id" horizontally.

	window_id	window ID (use WMNGR_BACKGROUND for background window)
	direction	scroll direction
			(WMNGR_LEFT -> scroll left,
			 WMNGR_RIGHT -> scroll right)
	[num_columns]	number of columns to scroll (default is 1)

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid number of columns or window ID
	CBS_NO_WINDOW		requested window does not exist

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	window_hscroll_offset_c, window_hscroll_page_c,
	window_scroll_to_left_c, window_scroll_to_right_c, window_scroll(_c),
	window_scroll_page_c, window_set_parameter_c, intro_tv_windows

	C/C++ usage:

	short	window_id;
	int	status;
	int	direction = WMNGR_RIGHT;
	int	num_columns = 1;

	status = window_hscroll_c(window_id,direction,num_columns);