An integrated Ethernet PHYMAC apparatus having a single link partner capability register shared between a PHY and a corresponding MAC, which implements IEEE Standard 302. The stress waves-are preferably detected in a narrow frequency range of 35-40KHz. Then a second intermediate value is generated from the application of the first intermediate value to the tone scale function, and an enhanced pixel value is then obtained from application of the inverse of the scaling function to the second intermediate value. After the rate is identified, the method scans the corrupted frame by checking the MMTTTM or MMFM bits to determine whether signaling is present in the frame. This method allows linking of multiple computer operators or users in a single collaborative session, involving multiple collaborative applications transparent to the operator or user. The head-up display device further includes a movable member attached movably to the housing, and the display unit is fixed on the movable member.