where.i4.v = in_window_interior_c(window_id.i2.v [,ret_occluded.i4.v])

	This routine determines if the TV cursor was in the interior of
	the specified window the last time window_intype was called.

	window_id	window ID (use WMNGR_BACKGROUND for background window)
	[ret_occluded]	flag to control return of occluded window information
			(TRUE -> return information for occluded windows,
			 FALSE -> return FALSE for occluded windows

	This function returns status values as follows:

	TRUE			inside the borders of the window
	FALSE			on the window border or outside of the window

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	in_window_c, in_window_field(_c), in_window_box(_c), binfld(_c),
	binbox(_c), in_window_line(_c), window_intype, window_intype_put_data_c,

	C/C++ usage:

	short	window_id;
	int	in_interior;
	int	ret_occluded = FALSE;

	in_interior = in_window_interior_c(window_id,ret_occluded);