num_switch.i4.v = wn_window_has_switch_c(window_id.i4.v)

	This routine will return the number of switches presently defined
	for a given graphics window.

	window_id	window ID (use WN_BACKGROUND for background window)

	This function returns status values as follows:

	CBS_NO_SUCH		window has no switches
	otherwise		number of switches defined for this window

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	wn_switch_create_c, wn_switch_delete_c, wn_switch_window_delete_c,
	wn_switch_read_c, wn_switch_pressed, wn_switch_set_state_c,
	wn_switch_disable_c, wn_switch_enable_c, wn_switch_relabel_c,
	wn_switch_redraw_c, window_has_switch_c

	C/C++ usage:

	int	num_switch;
	int	window_id;

	num_switch = wn_window_has_switch_c(window_id);