wn_read_background_size

	wn_read_background_size(height.i4.r, width.i4.r)

	This routine allows the calling program to read the size of
	the background graphics window.

	height		returned height of the background window in pixels
	width		returned width of the background window in pixels

	This function requires the following include files:

	cbslib_h

	Related functions:

	wn_set_background_size_c, wn_read_background_format,
	wn_set_background_format_c, wn_read_display_size, wn_screen_init(_c),
	intro_graphics_windows

	C/C++ usage:

	int	height;
	int	width;

	wn_read_background_size(&height,&width);