One embodiment of the invention determines position of an object with respect to an original location. In response to exerting an elastic winding force or unwinding force by the resilient member the sliding assembly is adapted to slide with respect to the fixed assembly and a balance of force between the fixed assembly and the sliding assembly is reached when the sliding stops for maintaining both the support and the body at an angle about the supporting surface. The terminal adaptor will initiate a packet session with the communication terminal by sending an initiation message including the reference number to the service node.