Methods and systems for servicing requests made from any of multiple user interfaces associated with a user are provided. The bone anchors have a generally cone-shaped head with two or more cutting edges which reduce the amount of force required to implant the bone anchor into bone. Other aspects of the invention include authorization and authentication components that determine access rights of client computers. The resilient member is configured to expand radially outwardly to permit passage of the stud, yet the surface of the structure contacting the outer surface of the resilient member prevents movement of the outer surface radially outwardly.