wn_read_background_format

	wn_read_background_format(num_rows.i4.r, num_columns.i4.r)

	This routine determines how many rows and columns of characters can
	be displayed on the background graphic window using the presently
	selected text size.

	num_rows	number of rows of characters possible
	num_columns	number of columns of characters possible

	This function requires the following include files:

	cbslib_h

	Related functions:

	wn_set_background_format_c, wn_read_background_size,
	wn_set_background_size_c, wn_read_text_format, wn_text_size(_c),
	wn_text(_c), wn_display_value(_c), wn_read_display_size,
	intro_graphics_windows

	C/C++ usage:

	int	num_rows;
	int	num_columns;

	wn_read_background_format(&num_rows,&num_columns);