status.i4.v = window_hscroll_page_c(window_id.i2.v, direction.i4.v)

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

	window_id	window ID (use WMNGR_BACKGROUND for background window)
	direction	scroll direction
			(WMNGR_LEFT -> scroll left,
			 WMNGR_RIGHT -> scroll right)

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid 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_c, window_hscroll_offset_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;

	status = window_hscroll_page_c(window_id,direction);