A symbiotic computing system includes a plurality of symbiotic partners that are communicatively coupled with one another and each of which has a respective instance of a managed resource. In one embodiment, the heart rate estimation apparatus includes a group of six RR storage structures that receives an input of six successive RR interval values. In this manner, the size of the outlet may be adjusted to change the rate at which contents pass from the stomach through the outlet. The call handling can also depend on the time at which the call is made. The upper corner facets are spaced from the girdle.