status.i4.v = wn_set_background_format_c(num_rows.i4.v,

	This routine allows the calling program to resize the background
	graphics window to accommodate the requested number of rows and
	columns of characters.  It also resets the color graphics context,
	clears the window, and disables the cursor.

	num_rows	number of rows of characters to allow
	num_columns	number of columns of characters to allow

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid dimension value

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	wn_read_background_format, wn_set_background_size_c,
	wn_read_background_size, wn_text_size(_c), wn_text(_c),
	wn_display_value(_c), wn_screen_init(_c), intro_graphics_windows

	C/C++ usage:

	int	status;
	int	num_rows = 45;
	int	num_columns = 90;

	status = wn_set_background_format_c(num_rows,num_columns);