did_it.i4.v = window_delete_border_button_c(window_id.i2.v, border.i4.v,
						    column.i4.v, num_chars.i4.v)

	This routine will delete a text button on a window border which
	was created by an earlier call to window_border_button_c.

	window_id	window ID
	border		button border
			(WMNGR_TOP_BORDER -> top border,
			 WMNGR_BOTTOM_BORDER -> bottom border)
	column		starting window column
	num_chars	number of ASCII characters in the button label

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		background or invalid window ID passed or
				invalid border or column
	CBS_NO_WINDOW		requested window does not exist
	CBS_INVTYP		requested window has no border
	CBS_INVSIZ		button field extends beyond the end of the
	CBS_NO_SUCH		requested border button doesn't exist
	CBS_NOTENB		action not enabled due to active window
				move or resize

	This function requires the following include files:

	cnsparam_h, cbslib_h, acnet_errors_h

	Related functions:

	window_border_button_c, window_close_button_c,
	window_menu_button_c, window_tvm(_c), window_set_clip_c,
	window_button_create_c, window_button_delete_c, switch_create_c,
	switch_delete_c, intro_tv_windows

	C/C++ usage:

	short	window_id;
	int	status;
	int	border = WMNGR_TOP_BORDER;
	int	column = 1;
	int	num_chars = 7;

	status = window_delete_border_button_c(window_id,border,