window_set_background_size(_c)

	status.i4.v = window_set_background_size(num_rows.i4.r,
						 num_columns.i4.r)

	status.i4.v = window_set_background_size_c(num_rows.i4.v,
						   num_columns.i4.v)

	This routine allows the application programmer to set the size
	of the background (or root) window.

	num_rows	number of rows (must be a value between MIN_TV_ROWS
			and MAX_TV_ROWS inclusive)
	num_columns	number of columns (must be a value between MIN_TV_COLS
			and MAX_TV_COLS inclusive)

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid number of rows or columns
	CBS_MEMFAIL		dynamic memory allocation failure

	This function requires the following include files:

	cnsparam_h, cbslib_h, acnet_errors_h

	Related functions:

	window_read_background_size, window_size(_c), window_construct(_c),
	intro_tv_windows

	C/C++ usage:

	int	status;
	int	num_rows = 30;
	int	num_columns = 80;

	status = window_set_background_size_c(num_rows,num_columns);