status.i4.v = slider_update_c(slider_id.i4.v, value.r4.r, action.i4.r,

	This routine services a slider in a window created by an earlier
	call to slider_create_c.  This should be called upon the receipt
	of a user interrupt event.

	slider_id	ID of selection field type (returned from a prior
			call to slider_create_c)
	value		returned slider value
	action		returned action taken on slider
			(SLIDER_NOT_MOVED -> slider was not changed,
			 SLIDER_INCREMENTED -> slider was incremented,
			 SLIDER_BLOCK_INCREMENTED -> slider was block
			 SLIDER_INCREMENT_LIMIT -> an attempt to increment the
						   slider was made, but it was
						   already at its limit,
			 SLIDER_DECREMENTED -> slider was decremented,
			 SLIDER_BLOCK_INCREMENTED -> slider was block
			 SLIDER_DECREMENT_LIMIT -> an attempt to decrement the
						   slider was made, but it was
						   already at its limit,
			 SLIDER_DRAGGED -> slider was dragged)
	delta_value	returned change in slider value

	This function returns ACNET status values as follows:

	OK			success
	CBS_NO_SUCH		slider does not exist
	CBS_READONLY		slider was not moved

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	slider_create_c, slider_delete_c, slider_read_c, slider_set_c,
	slider_get_values_c, slider_set_values_c, slider_was_moved

	C/C++ usage:

	int	status;
	int	slider_id;
	int	action;
	float	value;
	float	delta_value;

	status = slider_update_c(slider_id,&value,&action,&delta_value);