status.i4.v = window_last_io_location_c(window_id.i2.v, last_row.i4.r,

	This routine returns the last character cell in a window that has
	been written to.

	window_id	ID of desired window
	last_row	last row written (a value of -1 indicates that
			no window I/O has been done)
	last_column	last column written (a value of -1 indicates that
			no window I/O has been done)
	[physical_cell]	type of coordinates to return
			(TRUE -> physical cell coordinates (default),
			 FALSE -> logical scroll buffer coordinates with
				  the first row being 0)

	This function returns status values as follows:

	OK			success
	CBS_INVARG		invalid window ID was specified
	CBS_NO_WINDOW		window doesn't exist
	CBS_MEMFAIL		dynamic memory allocation failure
	CBS_INVTYP		request was for logical cell, but last
				I/O was not in scroll buffer

	This function requires the following include files:

	cnsparam_h, cbslib_h, acnet_errors_h

	Related functions:

	window_init_sequential_write_c, window_write_line_c,
	window_write_xchar_line_c, window_write_scroll_c,
	window_write_scroll_xchar_c, window_sequential_write_c,
	window_tvm(_c), window_tvmx(_c), window_write_string_c,

	C/C++ usage:

	short	window_id;
	int	status;
	int	last_row;
	int	last_column;
	int	physical_cell = TRUE;

	status = window_last_io_location_c(window_id,&last_row,&last_column,