Techniques for selecting a portion of a 3D virtual environment are disclosed, where the portion of the 3D virtual environment may be one or more objects in the 3D virtual environment or one of scenes in the 3D virtual environment. A data structure is maintained that includes information about a link state for each network element in the plurality of network elements. The reader transmits the information from the device to the server. The stem may be free to rotate with respect to the locking shaft, or vice versa, while the grasping head may be formed at the distal end of the stem with a couple of prongs or clamps toward the other according to an angular relative rotation of the stem with respect to the locking shaft. A federated user model allows normal end users to monitor devices relevant to the part of a service they are responsible for, while allowing administrative users to view the fault and performance of a service in an end-to-end manner. 78 gcm3 for carbon material A and 1.