sive will be the key "greener" video. One possibility is that screen technology will not necessarily travel with the end device; instead, the display screen and video recording device will become a fixed resource that end devices participating in UC can manipulate. In this future, screens will be used for multiple purposes, from advertising to public announcements and will also double as screens to be used for personal UC in some type of pay per use or shared environment. The device that was initiating the call will also start a connection with the display device and utilize the hardware with the SP charging a small additional fee to uti- lize this previously public device. When the device was not utilized for personal calls, the device would revert to being used for public announcements or advertising to help recov- er the cost. The ramifications are that display and recording devices could be optimized to use low power without being dependent on battery technologies. The devices that move with the customers, much like today's traditional cell phones, would be optimized for long battery life, but would take advantage of other devices. The devices that are fixed resources at specific locations can be used for multiple purposes, such as public displays, and could take advantage of passive power sources such as solar energy for outdoor devices. This more efficient utilization of resources will result in lower power consumption and be a major component of the greening of UC. Summary The future of UC in the short term will not have the speed and dramatic changes that have occurred in other areas such as personal computing; however, in the long term, the changes will be dramatic and have more of an impact than any other technology change in the 21st century. The revolution in communications will fundamentally change the nature of people's lives. The capability to share rich personal experiences across vast dis- tances with the aid of immersive telecommunications equipment will enable cultures to continue to thrive and