was_pressed.i4.v = wn_switch_pressed([last_pressed.i4.r])

	This routine will return a value of TRUE if a switch in a graphics
	window has been pressed since the last time this routine was called.

	[last_pressed]	ID of last switch pressed (valid only if a value
			of TRUE is returned) (returned by a prior call to

	This function returns status values as follows:

	TRUE			a switch has been pressed
	FALSE			no switch has been pressed

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	wn_switch_read_c, wn_switch_create_c, wn_window_has_switch_c,
	wn_switch_delete_c, wn_switch_window_delete_c, wn_switch_set_state_c,
	wn_switch_disable_c, wn_switch_enable_c, wn_switch_relabel_c,
	wn_switch_redraw_c, switch_pressed

	C/C++ usage:

	int	was_pressed;
	int	last_pressed_id;

	was_pressed = wn_switch_pressed(&last_pressed_id);