A method and apparatus for entering a net within a group communication network provides for requesting a current list of available nets that the communication device may join from a controller and, after receiving the current list of available nets from the controller, selecting a net from the current list of available nets. According to the aforementioned method, during the video mode, the video may be played back smoothly and the video and the audio are synchronized; during the operating mode, a low latency delay control experience may be provided. The device may be programmed by the user or, alternatively, may be programmed by a trainer or therapist caring for the user. The system further includes a repair processing module for administering warranty-specific service based on the diagnosis and the service information.