did_it.i4.v = window_hilite_c(window_id.i2.v, row.i4.v,
				      left_column.i4.v, num_columns.i4.v)

	This routine inverts the color of a text string in the window
	indicated by "window_id" starting at "row", "column" and having a
	length of "num_chars" characters.

	window_id	window ID (use WMNGR_BACKGROUND for background window)
	row		row of text string
	left_column	starting column of text string
	num_columns	length of field in columns

	This function returns status values as follows:

	TRUE			window I/O actually done
	FALSE			no window I/O done

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	window_hilite_line_c, hilite_create_c, hilite_delete_c, hilite_update_c,

	C/C++ usage:

	short	window_id;
	int	did_it;
	int	row = 1;
	int	left_column = 1;
	int	num_columns = 10;

	did_it = window_hilite_c(window_id,row,left_column,num_columns);